Using excel is fine (I still do that myself), but I prefer professionally designed platforms for keeping track of your trades.
This also comes in quite handy for tax compliance purposes.

I personally use cointracking.info (there is a free version, up to 250 trades or something like that),
but there are many more platforms like that, some have apps, some don't:

- Altpocket io
- Blockfolio
- Coinfolio
- Libra.tech