I've asked how to add more tutorials for the Help menu in the past. It was one of my first posts on an Inkscape mailing list. Someone did answer, but it was pretty flakey. Something like, 'yeah I need to do that someday' (meaning make it possible for people to add more tutorials). I don't remember who answered - it was a few years ago.
In my opinion, this is an oversight which needs some attention. But that kind of response did not inspire me to make a bug report. It inspired me instead to double-down on what I think is this site's best feature (see the Home tab)
https://forum.inkscapecommunity.com/index.php.
You're certainly welcome to contribute to our small collection of tutorials (IC Tutorials tab). If you'd like, you can PM me a tutorial of yours, so I can review it. If it's clear you know what you're talking about, I'll promote you to IC Mentor (member group), which will give you access to this site's tutorial making features.
However, using the Inkscape website's gallery feature (InkSpaces) would give your tutorials the biggest audience possible. There are some drawbacks though. If you want your tutorials to have working links, I think the only way to do it would be to upload PDF versions. (I guess PDF is accepted, but I haven't actually tried it.) Otherwise use PNG or SVG. Or upload some kind of thumbnail to represent your tutorials, and link to them, wherever you have them hosted. You're welcome to host them here if you like. But dropbox or imgh.us (which is an image host that accepts SVG files) or any other place would work just as well.