Blog by bob doto
Really good resource on practical application of the zettelkasten principle and also GTD. Note neccessarily perfect for academics, but very well written.
Link: https://writing.bobdoto.computer/blog/
Blog by zettelkasten
One of these wrote their thesis on zettelkasten (i think) and it is quite comprehensive. You can get lost in here because there is so much info, but all in all it is a really good source on how to take good notes and structure knowledge
Link: https://zettelkasten.de/overview/
Blog post by maggie appleton
This blog does cover many subjects not relevant to knowledge workers but this one particular post is a very good overview of the PARA method and what it means