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Technical knowledge that sticks

Free flashcards powered by spaced repetition. Master data structures, system design, cloud, and more — no signup required.

Pick a topic below to start learning.

Coding

🚀

Advanced Data Structures

Fenwick trees, tries, unions...

5 lessons  ·  51 concepts

⚙️

Algorithms

Sorting, searching, traversal...

6 lessons  ·  88 concepts

🧠

Big O Notation

Complexity analysis essentials.

4 lessons  ·  48 concepts

📦

Data Structures

Arrays, stacks, trees, and more.

8 lessons  ·  101 concepts

🧩

Dynamic Programming

Memoization, tabulation, classic problems...

6 lessons  ·  54 concepts

System Design

☁️

AWS

EC2, S3, Lambda, VPC, and more.

7 lessons  ·  77 concepts

☸️

Kubernetes

Pods, Deployments, Services, networking...

7 lessons  ·  75 concepts

🌐

Networking

TCP/IP, DNS, TLS, HTTP, proxies...

6 lessons  ·  63 concepts

🏗️

System Design

Load balancing, caching, scaling...

8 lessons  ·  87 concepts

Infrastructure

🐳

Docker

Containers, images, Dockerfiles, networking, volumes...

6 lessons  ·  47 concepts

🐧

Linux

Processes, permissions, filesystem, shell commands...

6 lessons  ·  57 concepts

Other

🤖

AI/ML Fundamentals

AI/ML interview vocabulary — neural nets, transformers, embeddings, RAG. Hands-on problems coming later.

1 lessons  ·  8 concepts

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