The main reasons I saw investors can lose money is because they sell because of panic, if they did not sell they will still make the money back if invest good coins
Panic will play a role in your decision making only when you are not confident about the coin, you have invested.
If you choose coins after a strong due diligence then you can easily continue your holding regardless of whatever corrections you are encountering. So, TA and FA are more important not only for active traders but also for investors.
without losing money, investors won't learn much.
To learn much, you do not need to be an investor neither.
all investors must have the intention to take profits, they will force themselves to know well the effective ways to invest then.
That learning process should be done before finalizing the investments. Basically being investors in crypto space also requires lots of preparations like crypto trading and if you are too busy and unable to find time for learning then you may stick with bitcoin investments alone.