Just a spreadsheet listing all the altcoins that I have bought and how much I bought it.
That way I could see if there are changes already. Not just guessing when and how much I buy it.
It can easily be forgotten once you are holding a lot of them. Better to make a list.

Now after that, you will have to maintain. Monitoring all the prices everyday. It is hard work and 2 of them is being checked like every hour. Sure eats a lot of time. That is why some of the traders tend to make it almost like a job.