https://docs.obsidian.md/Home

the above has a tutorial on writing plugins

https://github.com/franzos/nostr-ts

the above is a library to develop nostr applications in typescript. — This is a comment on: https://yakihonne.com/flash-news/nevent1qqp52ajnqgsx8zd7vjg70d5na8ek3m8g3lx3ghc8cp5d9sdm4epy0wd4aape6vsrqsqqqqqp9dt0t3