I was strongly influenced by reading Steve Herman’s summary of the Grinnell method of record-keeping and field notes and have been following this format, although a bit less rigorously, for about ten years now.
https://www.google.com/books/edition/The_Naturalist_s_Field_Journal/HKKXQgAACAAJ?hl=en
Briefly, I use a Rite-in-the-Rain field notebook to take notes while I’m out hiking and looking for things in the field, then transcribe my often-scribbled notes from the notebook into a Field Journal that I keep in Microsoft Word, using the format for daily entries described in the book (weather, habitat, route taken, species seen, specimens collected, etc.). I also have separate “Species Accounts” for when I have a more detailed behavior or natural history observation of a particular species (mostly vertebrates for me). It take a bit of work, but makes dealing with my photos much easier later, as everything is placed in context and I can remember where I was and what I did that day… :)