Every Free Quiz and Course on SkillAI Hub, Sorted by What You Actually Want to Learn

bysantosh •
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I have a habit that annoys my colleagues: before I claim I “know” something, I try to fail a quiz on it. It’s the fastest way I’ve found to separate
things I actually understand from things I’ve merely read about. Lately I’ve been doing this on SkillAI Hub, a free quiz and
course site, and I ended up working through most of its public catalog.

This post is the index I wish the site had given me on day one: every public quiz and course, grouped by what you’re actually trying to learn, with notes
on how I’d use each format. Everything here is free to play and needs no signup.

A quick word on the formats before the lists, because they’re not interchangeable:

  • MCQ quizzes are the classic four-option kind. Good for a first pass on a topic.
  • Code reading quizzes show you real snippets and ask you to trace, debug, or fill in code. These are harder than they look and where I learned the
    most.
  • Fill-in-the-blanks force you to recall the exact term with no options to lean on. Brutal, in a good way.
  • Memory quizzes show you content against a countdown, then hide it and quiz you on the details. Oddly effective for things like commands and
    definitions.
  • Interview prep mixes multiple choice, yes/no, and open questions with model answers.

My routine, if you want to steal it: take a quiz cold and note what you miss, read up (or take one of the courses below), then retake it a few days later.
The gap between attempt one and attempt two is the actual learning.

JavaScript and TypeScript

Start with the JavaScript ES6 quiz if you’re unsure where you stand. If you clear that easily, Scope &
Closures and The Ultimate JavaScript
Challenge will find the holes. The closures code-reading quiz humbled me on question
two.

Courses that pair well with these:

React, Angular, and the frontend

There’s a lot here. The honest path: React Basics → React
Hooks → React Hooks Deep Dive → React
Performance. The performance one has 15 questions and I did not clear it on the first try.

Blanks and memory variants, for when the multiple-choice crutch has to go:

Course: Master React Performances.

C# and .NET

The C# section is unusually deep — someone clearly uses this site for .NET work. The threading material is the standout: do the C# Multithreading
MCQ first, then the code-reading version,
then .NET Threading with 13 questions. If you survive all three you’re better at this than most of us.

Course: C# New Features.

Python

Python courses, in roughly the order I’d take them:

  1. Python From Zero To Hero — Best for Beginners (there’s also a 6-unit
    version    )
  2. DSA with Python
  3. Data Science with Python — 5 units, the meatiest course on the site
  4. Machine Learning using Python
  5. Azure Databricks and Python / Spark and
    Databricks

SQL and data

If you only do one thing from this section, do SQL Window Functions. Window functions are the
single highest-leverage SQL topic nobody bothers to properly learn.

Courses: SQL Interview Questions, SQL
Optimizations (5 units), Snowflake Database.

Architecture, design patterns, and system design

This is the section I keep coming back to. Design pattern quizzes are easy to write badly; these mostly avoid the trap of testing pattern names instead
of pattern judgement.

Courses: System Design (part 2), Design
Pattern.

Auth and security

Three quizzes, and together they cover more OAuth ground than most tutorials:

DevOps, cloud, and the command line

The blanks format shines here — there’s no faking a Docker flag when there are no options to choose from.

Courses: Jenkins — From Zero to Hero, Docker
Networking (4 units), Shell Scripting, Terraform
Basics, AWS For Beginners, Azure
Blob, Azure Service Bus and Kafka, ServiceNow
Basics.

Off the beaten path: Rust, assembly, and friends

Interview preparation

Eight structured sets, each 10 questions mixing formats, with model answers for the open-ended ones. The behavioral/STAR one is the sleeper hit —
technical people consistently under-prepare for exactly that round.

For hands-on coding practice there’s also a separate DS & Algorithms practice area with LeetCode-style problems you
solve in the browser (test cases, progressive hints, full solutions), and an Algo Coach section with visual
walkthroughs of the classic patterns. The course companion is Coding Interview Questions.

Not everything is programming

A smaller shelf, but it’s there:

Non-tech courses too: Public Speaking & Communication and Financial Literacy for
Beginners, plus a few on newer tooling: Claude AI Online
Course, Prompt Engineering, and Model Context
Protocol — MCP is new enough that finding any structured material on it is notable.

Please do not post any spam link in the comment box😊

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