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Course catalog
Build knowledge you can put to work. Explore practical courses in business and AI, one lesson at a time.
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Read freely. See each course’s review status.- Online course
Accounting Fundamentals
Go from zero to writing correct journal entries, producing financial statements, and closing a month. No prerequisites, no degree assumed.
reference fixture — not teaching material
Skills you’ll explore
- The accounting equation
- Chart of accounts
- Double-entry bookkeeping
- Journal entries
- General ledger
- Trial balance
- +11 more
- Online course
Building AI Agents
Design, build and evaluate agents that do real work: when an agent beats a plain workflow, how the loop actually runs, how to design tools a model can use well, how to keep it safe and affordable, and how to know whether it works.
not yet expert-reviewed
Skills you’ll explore
- Language model fundamentals
- Prompt design
- Choosing between a workflow and an agent
- The agent loop
- Tool design
- Context engineering
- +10 more
- Online course
U.S. Residential Roofing Basics
Learn the basics of U.S. residential roofing: roof shapes, materials, layers, flashing, ventilation, and drainage. Read roofing proposals and document concerns safely through diagrams, videos, and practical exercises. Local requirements vary.
not yet expert-reviewed
Skills you’ll explore
- Roof and solar coordination
- Roof system components
- Roof shapes and slope
- Roof covering fundamentals
- Roof drainage and flashing
- Attic ventilation and moisture
- +2 more
- Online course
U.S. Residential Solar Fundamentals
Understand U.S. residential solar systems, from PV cells to household electricity. Explore modules, inverters, batteries, energy flows, net metering, and net billing through diagrams, videos, and worked examples. Utility rules vary by location.
not yet expert-reviewed
Skills you’ll explore
- Photovoltaic fundamentals
- Solar power and energy units
- Residential solar components
- Battery and backup fundamentals
- Solar self-use, import, and export
- Net metering and net billing
- +2 more