Logseq it defaults to a daily journal and uses Markdown files (again, daily files by default)

It has a whiteboard function and can “embed” images, videos, etc (they’re obviously links to asset files stored separately to the markdown text file…)

There’s an Android app which I sync to Windows and Linux machines via syncthing - the App doesn’t have plugin support yet, but IMHO, on the phone, I just want to type notes…

It can be hosted on a web server, but I have not tried that (more resources to setup & maintain from my POV)

I tried Obsidian and Joplin in the past, but this just seems to be simpler, opener (if that’s a word) and fits to my needs easily.

There’s also a load of videos on youtube to get started…