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45 entries found
Computing and Networks
Learn what the CPU, memory (RAM) and storage do, how they work together when you open a file, and why a computer feels slow when one of them runs short.
Updated October 30, 2026
Computing and Networks
An operating system manages hardware, runs programs and keeps them apart. Learn its main jobs, what the kernel does, and where Windows, macOS and Linux fit.
Updated October 30, 2026
Computing and Networks
Learn what a file, a folder and a file system are, how paths and extensions work, and why drives are formatted, using a simple trip-planning example.
Updated October 30, 2026
Computing and Networks
See the big picture of the internet: networks joined together, providers, packets, routers and servers, and how data travels from your device to a website.
Updated October 30, 2026
Computing and Networks
An IP address is the number that lets devices find each other on a network. Learn IPv4 and IPv6, public and private addresses, and how to find yours.
Updated October 30, 2026
Computing and Networks
DNS turns a name like example.com into the IP address a computer needs. Learn how a lookup works, what caching does, the main record types and common problems.
Updated October 30, 2026
Computing and Networks
Follow a web page from the moment you press Enter: the URL, the HTTPS connection, the request and response, status codes and how the browser builds the page.
Updated October 30, 2026
Computing and Networks
Learn the difference between a modem and a router, how Wi-Fi fits in, how to secure your home network step by step, and how to fix common connection problems.
Updated October 30, 2026
Computing and Networks
Learn what the command line is, how to open it on Windows, macOS and Linux, and how to check your location, list files and change folders with safe commands.
Updated October 30, 2026
Logic and Programming
Programming means writing exact instructions for a computer. Learn what code is, how a program runs, and what a first small program looks like.
Updated October 30, 2026
Logic and Programming
A variable is a named place to keep a value. Learn the main data types (numbers, text, true/false), how to convert between them, and common traps.
Updated October 30, 2026
Logic and Programming
Learn how if, elif and else let a program choose between paths, how comparisons and and/or/not work, and the mistakes that break decisions.
Updated October 30, 2026
Logic and Programming
Learn what for and while loops do, how to pick between them, how break and continue work, and how to avoid infinite loops, with a shopping cart example.
Updated October 30, 2026
Logic and Programming
A function is a named block of code you can run again and again. Learn parameters, return values, scope and why functions keep programs tidy.
Updated October 30, 2026
Logic and Programming
Compare lists (arrays) and dictionaries: how each stores many values, how to read and change them, and how to choose between them for your data.
Updated October 30, 2026
Logic and Programming
A repeatable method for finding and fixing bugs: read the error, reproduce the problem, narrow it down, check values, fix one thing and confirm.
Updated October 30, 2026
Logic and Programming
An algorithm is a finite list of clear steps that solves a problem. See how to write one in everyday words and pseudocode, then turn it into Python code.
Updated October 30, 2026
Logic and Programming
Learn what a unit test is, how to write and run one with Python's unittest, how to pick test cases, and why small automated checks catch bugs early.
Updated October 30, 2026
Data and Databases
A database stores organized data so it can be searched, changed and protected. Learn what one is, how it differs from a file, and where you already use one.
Updated October 30, 2026
Data and Databases
Compare spreadsheets and databases on rules, shared editing, linked data and size. Use a short checklist to decide which tool fits your project.
Updated October 30, 2026
Data and Databases
Learn what tables, rows and columns are, why every table needs a primary key, and how a foreign key links one table to another, with a class list.
Updated October 30, 2026
Data and Databases
Learn to read data with SQL: pick columns with SELECT, filter rows with WHERE, sort with ORDER BY and cap results with LIMIT, using a bike shop table.
Updated October 30, 2026
Data and Databases
Learn what a SQL join does, how INNER, LEFT, RIGHT and FULL joins differ, and how to avoid the common mistakes, using two small tables.
Updated October 30, 2026
Data and Databases
Compare relational and NoSQL databases: how each stores data, where each fits, and how to choose, shown with the same recipe box stored both ways.
Updated October 30, 2026
Data and Databases
Compare CSV and JSON: how each file is written, what each handles well, where each breaks, and which to pick, shown with one food truck menu.
Updated October 30, 2026
Data and Databases
Learn a repeatable way to clean messy data: inspect, copy, fix spacing, case, dates, blanks and duplicates, then check the result. Includes SQL examples.
Updated October 30, 2026
Data and Databases
Learn how to design a small database: list entities, choose keys, map one-to-many and many-to-many relationships, and avoid repeated data, with a music school.
Updated October 30, 2026
Security Basics
Learn what makes a password strong, how to build a memorable passphrase, and how a password manager helps you keep a unique password for every account.
Updated October 30, 2026
Security Basics
Understand what two-factor authentication is, the main types of second step, what it stops and what it does not, and which accounts to protect first.
Updated October 30, 2026
Security Basics
Learn the warning signs of phishing emails, texts and calls, a simple check to run before you click, and what to do if you already did.
Updated October 30, 2026
Security Basics
Learn what software updates and security patches are, why attackers target old software, and how to keep your devices current without the hassle.
Updated October 30, 2026
Security Basics
Learn what a backup is, how the 3-2-1 rule works, how to set up a simple routine for photos and documents, and why you must test a restore.
Updated October 30, 2026
Security Basics
A plain guide to the main types of malware, including viruses, worms, trojans, ransomware and spyware, how each one behaves, and how infections start.
Updated October 30, 2026
Security Basics
Learn how encryption turns readable data into ciphertext, the difference between symmetric and public-key methods, and where encryption stops helping.
Updated October 30, 2026
Security Basics
Find out whether public Wi-Fi is safe, what a VPN actually does, what it cannot do, and simple habits that protect you on any network.
Updated October 30, 2026
Security Basics
Learn the three core goals of information security, see them applied to a small clinic scenario, and understand the trade-offs between them.
Updated October 30, 2026
Careers and Skills
A plain map of the main areas of IT work: support, systems, networks, software, data and security. See how they differ and where each one starts.
Updated October 30, 2026
Careers and Skills
See what help desk and IT support staff actually do: tickets, troubleshooting, escalation, documentation and the skills the work builds.
Updated October 30, 2026
Careers and Skills
Learn what software developers do besides typing code: understanding needs, designing, testing, reviewing and maintaining software, and how people learn.
Updated October 30, 2026
Careers and Skills
Learn how data analysts turn records into answers: asking questions, cleaning data, analyzing it and explaining results, with a worked example.
Updated October 30, 2026
Careers and Skills
Learn what cybersecurity analysts do: monitoring, triage, vulnerability checks, incident response and reporting, with a worked alert example.
Updated October 30, 2026
Careers and Skills
Understand what system administrators and network administrators do, how the two roles differ and overlap, and how a new-employee setup works.
Updated October 30, 2026
Careers and Skills
Learn what Git is and the four core ideas: repository, commit, branch and merge. Try a few safe commands on a practice folder.
Updated October 30, 2026
Careers and Skills
A step-by-step method for planning how to learn IT from scratch: pick a direction, set a weekly routine, choose a few resources and track progress.
Updated October 30, 2026
Careers and Skills
Learn a simple method for explaining technical problems in plain language: know the audience, lead with impact, use analogies and check understanding.
Updated October 30, 2026