I have been using scrivener for a while but obsidian looks like better software yor my needs. It has a sleek app too. I am planning on switching to linux which is how i found obsidian in the first place. In terms of writing a dissertation i am not sure how to use obsidain for the actual write up but i see there are plenty plugins to help with any use case needed.
Obsidian is fantastic. I learned about it from a random beginner guide like what you linked to here and made it my sort of catch-all place to keep notes about day-to-day events, to-do lists, random journal-type thoughts, and even the odd note for some online classes I'd signed up for.
But lately, I've been trying how to better use Obsidian and to organize my thoughts and notes in more coherent ways.
The first thing I've been trying to learn about is Zettelkasten. There are probably hundreds of channels teaching about both analog and digital Zettelkasten, but I enjoyed several video's from Vicky Zhao's channel. Here's one of her introductory videos here: https://invidious.no-logs.com/watch?v=GpV47rUYk8I
The other main thing I've been looking into to improve my Obsidian usage is Tiago Forte's PARA method. He's just started a series on his approach, and you can find the first episode here: https://invidious.no-logs.com/watch?v=T6Mfl1OywM8
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Discussion
I think Obsidian would be great for that. You could take loads of individual notes and find ways to link them altogether.
I've even seen plugins that help generate lists of all content with particular hashtags or combinations of hashtags, which I imagine would be ultra-helpful for academic writing.
Out of curiosity, what are you looking to do your dissertation on?