TRAINING HUB

Choose your training path

Learn the concepts, then pressure-test them in playable system design levels. Pick the mode that matches today's goal.

130+ Concepts130 available lessons
40 Levelsplayable system design scenarios
3 DifficultiesBeginner / Intermediate / Advanced
4 Modessurvive, incident, cost, design
LEARN CONCEPTS

Build the mental models first

Visual lessons explain HLD fundamentals step by step. The diagram moves with the explanation so beginners can see what each mechanism changes.

130 animated explainersBrowse Concepts
Foundations5
Networking And Protocols13
Apis And Communication8
Databases13
Specialized Databases2
Storage5
Caching7
RECOMMENDED
PLAY LEVELS

Practice with real architecture pressure

Drag cloud components, run the simulation, read the metrics, and iterate. Beginner levels guide the next move; advanced levels ask you to prove tradeoffs.

11 Beginner / 16 Intermediate / 13 AdvancedChoose Level
SurviveHold uptime while traffic ramps.
10
IncidentDiagnose and recover before SLA burns.
10
CostMeet the target without breaking the path.
10
DesignTurn product briefs into runnable systems.
10
SUGGESTED PATH

Use both modes together

01New to HLDStart with foundations and networking.02Know the basicsPlay beginner and intermediate levels.03Interview prepUse advanced design prompts and metrics.