Six key learnings from a friend/mentor in investing:-

1. Investing is a game of probabilities and not possibilities.

2. Sizing is the most important decision that you make.

3. Being a generalist and learning from sectoral experts is fun.

4. Identify the key variables

And learn how to probabilistically see how these variables move in the future.

5. Benchmark companies within a sector and then see which one is doing what, it will sooner or later reflect in financials.

6. Network as much as you can. Network is the modern day networth.