From a model call
to a dependable AI app.
Learning paths connecting concepts, code, and engineering decisions. One problem per guide, with examples and original sources.
My products
3AI Nav City
Find AI tools by use case, compare options, and visit their official sites.
Nav Tools
Format JSON, test regex, and convert encodings and timestamps. Small tools for everyday development.
Pixelprep
Compress, crop, watermark, combine, and split images on your device. No sign-up needed.
AI learning paths
All guidesModels & APIs
Understand model limits, build a reliable interface, and choose with evidence.
Explore the seriesRAG & retrieval
Turn documents into retrievable evidence and evaluate the answers they support.
Explore the seriesAgent engineering
Design workflows, tool contracts, and durable state for tasks that can recover.
Explore the seriesShipping AI apps
Handle security, latency, and failure before putting an AI application into use.
Explore the seriesA few places to start
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