As someone who is writing with a pen I use "write". I think you can also type on a keyboard but moving things around as you want is definitely possible.
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I use nextcloud notes. They are .md and work wonderfully imo. You can either edit them through nc or through the editor on linux (or vs code on windows). Tried obsidian, never got into it and its not open source.
Doesn't allow moving sections around inside a note.
Iβm not sure I understand what you mean. If I wanted to move a section I would cut and paste it. What alternative donβt I know about?
You can drag the sections anywhere on the page, beside another one, above to the right, etc. So you can write some text, make a table and place that to the right of the text. Or place an image anywhere.
Cut and paste only works in a linear fashion, up or down.
Notesnook
Go for the pain tier (even though it's FOSS) 100% worth it.
Think I might skip the pain tier π