About the platform

Unique opportunities for you

Structured domains and lessons from basics to a modern stack — with tools that stay with you in every topic.

Simulations, charts, and tasks embedded right in the lesson text.

Shared canvas for the group: sticky notes, arrows, polls, and sketches — plan topics and solve problems together in real time.

Build your path: quick access to the lessons you need.

Choose a language in settings — a chip next to each block shows that parallel version. Hidden when it matches your interface language.

Suggest edits and ask questions without leaving the lesson.

Find a topic, formula, or widget across the platform.

Voice search in interview mode — like a real conversation.

Reinforce material with short quizzes after a lesson.

Practice with problems and instant answer checks.

Calculator, SQL sandbox, regex, JWT, color and time converters, math trainers, and more from My Tools on the home page — for development, infrastructure, design, and exact sciences.

Capture thoughts and quotes — notes stay tied to the lesson.

New courses and domains keep joining the catalog.

Interactive widgets in lessons

Theory feels dry or abstract? Move sliders, change values, tap — and each step becomes clear.

Examples of some widgets from lessons:

SELECT user_id, SUM(total_cents) AS revenue
FROM orders
GROUP BY user_id;
Sourceorders
user_idtotal_cents
424999
4212990
72100
Result
user_idrevenue
4217989
72100
0 / 80 steps
f(x) = (x−2)² + 0.6·sin(5x)-1.00.21.42.63.85.0-0.91.84.57.29.9
Learning rate
Balanced
iteration—
x0.5000
f(x)2.6091
f'(x) =-5.4034
step = −lr × f′(x)
= −0.1 × -5.4034
= 0.5403
x_new = x + step
= 0.5000 + (0.5403)
= 1.0403
|f'(x)| = 5.4034 (→ 0 at the minimum)
Press Step or Start to run gradient descent

Support the project

One year access

Many platforms charge per course or lock you into pricey monthly plans. We chose a simpler model: one payment — the full catalog is yours.

A full year of every course, widget, and update. No auto-renewal: after 12 months nothing is charged unless you choose to extend.

  • All domains and courses
  • Single yearly payment
  • No hidden subscription
…for one year · full catalog

Your payment keeps servers running and funds new lessons and features.