I use syncthing for personal and work, and it’s great. Having said that I’ve found it struggles with versioning i.e. editing a document from multiple devices.

Look into something like Standard Notes for cross platform markdown editing. It’s e2e encrypted, works great, the dev is very responsive. Ymmv but I really like it, have it on every device I own and use it daily.

I’ve also just used a private git repo for editing docs from multiple devices. Once you get it set up it’s effortless, and most ide’s are extremely fun to use as text editors.