Fire in the Valley is the best computer history book I've read. It covers the very early history of the Altair (Hardware) and Bill Gates writing a version of Basic for it (Software). I would say it stops in the 90s since I've only read the first edition but apparently there are two more editions out now that cover events through Steve Jobs death. I think I'm due for a rereading.
I just setup Obsidian a couple days ago and have been using https://github.com/vrtmrz/obsidian-livesync which seems to work ok. I'm curious if SyncThing would be preferable. How does it handle conflicts? How often does it sync? Does it drain the battery on mobile if it syncs too often?