I use the traditional method... that is, I record the actual number I scored. I've also been known to count puts and note those very small in a corner of the box. And then there's the complication of dots games. Those need to be recorded. And other side bets... closest to hole on par threes, sandies etc.
The card can get a bit messy and if you don't have a solid marking style you can end up with a load of unintelligible hieroglyphics.
I have a golfing buddy who loves to manage all the games and bets on his scorecard. And we usually have a bunch. The card is filled with symbols, numbers, dots and circles. Only he knows how to tally these strange and peculiar ciphers.
There have been a couple of occasions where his complex markings have sparked some heated comment exchanges between friends.