I took notes even on things that didn't seem to matter. Some of those things I used later on, so it was a good thing I had them. I'll give you an example. Back in March my W sent me an email inviting me to spend the night at the house with her and the kids so we could wake up and do Easter morning together. Of course, I declined.
When she tried to get a restraining order against me last month based on an incident where the police came to our house in January I was able to produce a copy of the overnight invite. The judge was very interested in it - and even admonished my W a bit. Said, "You're telling me about an incident that happened in January and here I have an email where you're inviting him to sleep over in March."