Warren Buffett
Principles
Repeatable rules that beginners can study and adapt.
Applicable principles
Treat stocks as ownership stakes in businesses.
Prefer durable competitive advantages and understandable cash flows.
Stay disciplined when markets are euphoric or fearful.
You do not need many decisions, only a few major correct ones.
Turn these principles into a pre-investment checklist. If an idea cannot pass the checklist, staying out is often better than forcing action.