I take running notes throughout the day in my notepad, using a lazy, half implemented bullet journal system. I have an entry level fountain pen, a few uni-ball eye micro pens that I like and a mechanical pencil. Also, square grid dotted paper. It's a game changer.
For long term notes, things I need to remember, storing text details for all sorts of things I use Evernote. Love the web clipper. Also I dump lots of things in there throughout the day which helps for Dungeons & Dragons inspiration. I'm considering moving to OneNote though as I hear it's better suited for D&D dungeon master stuff.
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