Best pratices or things to avoid in general

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E.g. specifically when updating items lists on forms ! pageload vs on path vs on entry vs on exit ! What is the specific order on how things trigger? Is there another documentation other than the official docs? The docs dont tell me that much about such details for example

Following example

We have an id and that id can be referenced in 3 other fields!
Those ids are saved in a db.
The field should already exist in the db or is the same a new id that save.
So far so good break with condition and background change on value-change works too!
But ... is there any (simple) possibiliy that I could change the fields afterwars / also after form validation AND /OR break condition. So that can specifiy which fields are incorrect filled out?

Thanks in advance and have a nice weekend!
~Phil