I write on Libre Office. Nice simple word processor and spell checker.
My first edit pass is when pasting it on to Royal Road, which I do via Chrome. RR is where I started, and I am only using Chrome for pasting into RR because for some reason pasting to RR via Firefox messes up my formatting. I lose the paragraph spacing.
As I do not use Chrome for anything else, I have Grammarly installed there, and I use the free version to catch basic mistakes like missing a word or having a tense wrong; i.e. the red underlines. I don't let it do real editing. This version goes to Patreon and my wife gets a copy.
Now the first real editing pass begins, and my wife offers everything from rewording suggestions to small sections of additional content, as well as finding the mistakes that Grammarly missed.
When she's done, she sends it to me, and I go through and decide what to implement, skip, or change in a different way. Sometimes her suggestion tells me that she's misunderstood something I wrote, which means I need to make a different change in order to make my intentions clearer.
This version is then what goes live on both RR and SH, and is usually the end of my base editing for web publishing, though readers still sometimes find mistakes.
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I now have a contract with Podium for publishing 3 books worth of my series, so things get more complicated. A deep pass edit has been performed of book one by first my wife and then myself, and that was then submitted to Podium. I have also copied these edits to both RR and SH.
A professional editor has done an initial developmental pass on book 1, which is now back in my hands, while my wife is doing her part on book 2.
The current expectation is that after my current edit pass of book 1, the editor will be doing at least one more pass and sending it back. 2 more passes is quite probable.
This will repeat for each book that is published.
I do not enjoy editing, but it is the thing that must be done to polish the story and make it the best version it can be.