Me, I like notebooks to write in when I can’t type on my iPad or MacBook.
Jot down
It is useful to jot down little things like where I was at and what I was doing. So it helps me remember. I tried to use my phone, but I can write faster than I can type on my keyboard on my iPhone.
What do I use
I use the following notebook.
It is a wide-ruled Composition notebook

I have carried this with me for every trip since 2020. It really helps me out.
Got a new one
I did get a new one, but I am not sure when I will start to use it. It is a black Nomatic notebook

It is a nice notebook, but I don’t want to ruin it. I do have a bunch of the first ones. But I am going to take this on the next trip.
My thoughts
Get a notebook and use it to help you jot down thoughts and things you are doing. Really like how they fit in the tech backpack.