Street Complete is a great app for quests regarding existing features, but also consider the feature might not exist at all yet in OSM.

Map Complete is great for adding new features. It also asks a bunch of optional simple questions about the feature which gets converted into the relevant OSM tags. It's browser based but you can just add a shortcut to your home screen to have it quickly accessible.

I've just installed this now, thanks for the tip!

So many quests right on my street!