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Is it only for todos or can we take regular notes on it as well?

It has ability to take notes and even multiple comments on tasks. The details field allows adding sub items (markdown checklist) to a ticket.

There’s also a way of organizing tasks on a Kanban. It looks a lot like Trello.

Excellent. This will be my new notes app moving forward. Been frustrated with obsidian's complex design

Like we write Slack/Twitter threads, Vikunja's comment system will easily help you with that. Love its fluency and simplicity!