Keeping track of how much you investment in crypto?

Hi everyone, hope all is well.

I used to be involved with crypto a little while back, but didn’t do particularly well and ended up cashing out everything, however I’m thinking to get back into it but want to start off on the right foot.

So, my question is; how do people keep track of how much money they’re actually putting into crypto? I figured it’s all good and well buying crypto whenever you can, but if you don’t actually have an idea of how much fiat you’re putting into it, it’s kind of hard to discern how much you may be potentially making once it’s time to cash back out.

I did also try and have the disciple to keep notes on paper in a diary but found it was a bit long winded especially if you’re trying to make a spontaneous purchase when you’re not at home etc.

So can anyone recommend any decent phone apps which might be good for tracking this, while simultaneously telling you how much cryptop you might be holding and what it’s value is, in real time etc?

Cheers