Everything #OpenStreetMap related is welcome: software releases, showing of your work, questions about how to tag something, as long as it has to do with OpenStreetMap or OpenStreetMap-related software.
OpenStreetMap is a map of the world, created by people like you and free to use under an open license.
Join OpenStreetMap and start mapping: https://www.openstreetmap.org/.
There are many communication channels about OSM, many organized around a certain country or region. Discover them on https://openstreetmap.community/
https://mapcomplete.org/ is an easy-to-use website to view, edit and add points (such as shops, restaurants and others)
https://learnosm.org/en/ has a lot of information for beginners too.
I would agree with most people. I think drinking fountains, public toilets, shelters and just general shops (edit:with opening hours a bonus) are the most useful. Buses is also pretty cool info to have directly there. You can check Streetcomplete to diversify your contributions with ease as well, including adding wheelchair accessibility.
You could also take photos for !Panoramax@sopuli.xyz too? Then others can use your photos to add more stuff or just see the photos of your area.
Whatever you think. I met with mappers who only map rail and related stuff, others only different kind of pipes and manhole covers, some focus on electrical infrastructure, and street cabinets. Some people map anything that has a number or id. My favorite is street parking, lanes and sidewalks.
So map what you enjoy the most, this is not a job, it's a hobby.
Apart from the basic street layout, any information that's worth having for everyday life, e.g. bus stops, benches, trash cans, etc.
Also, you could try StreetComplete and see what infos are missing elsewhere.
At a time where shopping local is more important than ever, when I take a walk and pass in front of businesses I take the time to ensure they are properly listed with their current business hours.
To me it would probably be "navigational" stuff, like bike/pedestrian crossings, sidewalks and bike paths, one-way streets and illegal turns etc. Plot some test routes for walking/biking/driving and verify the directions make sense. Then the main POIs if not already added, maybe some basic zoning? Also make sure that the features that already exist are properly tagged.
Anyway, I think you shouldn't focus too much on what "you're supposed to map" and just map the features that you find useful/interesting. There are a ton of ways OSM can be used, so start with your own use case, and by making it better for you you will make it better for everyone :)
Public toilets are a good info
@shoki I would vote for things like Business and public utilities details are useful. e.g where is the post office, cafe, library, shop. Road information such as speed, direction, bus stops and bus services also very handy.