On Reddit it is (or at least was) considered polite if you edit your posts to correct spelling errors or clarify something that you added ‘EDIT: whatever I did’ to the bottom of your post. Is that the done thing here? Should it be?
I only followed that etiquette if it’s necessary information, otherwise future readers are going to have their time wasted.
Additionally, if the comment is sensitive in nature you could justify an Edit: remark.
But otherwise I just edit and leave it at that.
I’m seeing people doing Edit:, but not for typos. Seems unnecessary.
One tip that helps cross-instance communities connect: format your link as [ text ] ( /c/community@instance.whatever ) without the spaces. It keeps you on your local instance when browsing to another instance’s community.
I usually leave an "edit: " footer if the edit was significant. I just fixed a typo or spelling then I do it silently.
I don’t think that has really been common practice for many years. Fake “Edit” messages for comedic affect have long outnumbered real edit messages.