I use WKO+.

I used to use a daily planner and write stuff in it. I have piles of them, dating back from 1980 or 1981. What's nice about them is that I make notes about other stuff and on many entries I can remember the day or emotions or other things just from reading the one entry. This is back when I tracked miles, initially, and later hours. I'd sum each week on Sunday so I had some idea of what I did.

A friend has an interesting "component wear tracking" thing. It's handwritten on graph paper but it could easily be on a computer. I'm trying to remember how he set it up but it's something like this:

Columns:
Date, Miles, (Hours?), Cassette1, Cassette2, Cassette3, Chain1, Chain2, Chainrings, Total.

So he puts in the date, day's miles, I think hours. That's every single line. And the total miles.

Then he puts in the miles for whatever cassette and chain he used. Since he has 3 sets of wheels, he has three cassettes. He also has two chains I think he switches. So if Cassette1 is his training wheel and he rode them, he adds the mileage to that column.

This way he knows exactly how many miles are on each cassette, each chain. I think he tracks tire mileage too. I'm oblivious when it comes to tracking component wear - I have no idea how many miles I have on my tires for example, other than I just changed them after 2.5 years.

He has it handwritten so he can write the number as soon as he arrives home; part of his cool down is filling in the 20 seconds of writing necessary to update his log.