Amazingly useful plugins keep getting made for Obsidian. Plugins that help reduce friction to getting my material from other sources into flat markdown files that I then can edit, rework and do with as I see fit. Earlier I mentioned the Zotero plugins to extract PDF highlights and Zotero links into Obsidian. Today I started using the Kindle highlights plugin. It connects either to your Amazon account or you feed it your myclippings.txt file from your Kindle device.
It then pulls in your highlights into one note file for each book. You can edit the template for that note, to make sure it includes the information and metadata you want. Each highlight has a link directly to the highlight in your book, and when I click it opens my Kindle app on my Mac and jumps right to it.
Previously I would either download a CSV through the export notes function on a Kindle device which mails you your notes, or copy the myclippings.txt.
Using myclippings.txt is still the only way to get highlights from a book you did not add to a Kindle through Amazon (e.g. a direct upload from my Calibre library).
With one click, upon my first sync I now have about 100 notes with highlights from books I read. I never was a heavy highlighter, because of the friction of getting those highlights to a place where I could use them. That may now change.
Image: a screenshot of how highlights from one of my books now show up as notes in a markdown file, using the default template.