I wish I understood how to use them. I have half written scraps of paper and random text in random text files. Notebooks are about the best I can do. I can't write very well on a vertical board. It is really really uncomfortable and I end up obsessing on how bad it looks over solving the problem. Sometimes drawing on my iPad instead works, but that is another place to look for things.
I do like using Markdown + Mermaid. Obsidian is a nice little note taking app once I got it configured. It just takes me forever.
They have smaller white boards you can just prop up at a nice angle on your desk. These are what I use. Bigger ones that have to hang are for scheduling because I also black hole anything more than a week away. Also the white board is just off loading my thoughts so people can't interrupt me so badly. I still use note taking apps for tracking completed thoughts or things I have to come back to.