I don't do that much react, but I have found the following two kinds of logs very useful:
Question-Approach-Answer log: This is essentially my lab notebook as I am working through problems and solving them. I find the structure of writing out my questions explicitly and how I'm tackling them makes it easier to stay on-track and easier to know when I should stop solo debugging and email someone else on my team asking for help.
Feedback & Accomplishments: At the end of the day, write down any feedback you've given or received and anything you accomplished. This means that when Annual Review rolls around, it is much less excruciatingly painful to write peer reviews and your own self-evaluation.