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I would have made over 100,000 edits, but I learned (after months) to edit offline, then check an article's revision history to merge multiple edits into an article using just one SAVE operation. Tips:
Copying the edit buffer to a text editor allows search-and-replace.
Collaboration is facilitated by having titled sub-sections for each to edit.
Differences can also be checked by using offline text editors.
An edit-page window can be updated between sessions by login via a 2nd window, then previewing differences to merge intermittent changes as just one save.
Double-checking of modifications can avoid creating 20,000 edits, by waiting and combining updates into one save operation. Remember: Many planned changes can be postponed until other changes are ready.
Images edited
I have created and uploaded hundreds of images, many to Wikimedia Commons.
The Misplaced Pages project has struggled for years, but, like the initial years of the Internet, the information is maturing. Rampant vandalism is being fought by protected articles & anti-vandal bots.
I have added many articles, mostly on historic subjects.
The search for knowledge is a fool's errand. The most valuable knowledge I have learned is to be polite and forgiving with other people (although WP can be an extreme test of patience!).
(The name "Wikid77" is a contraction for "Wiki id77" as a user name.)