Paper notebook usage – how do I use and choose a paper notebook?

Add Clairefontaine to the vendor list, as their notebooks have served me well for a decade or more. Good paper feel, little or no ink bleed. I use their engineering versions to get the gridded paper which I find more useful that ruled paper. They have all sorts of sizes, but I use what is probably A4 as it’s roughly the size of my laptop and fits in the bag.