Uh, hey!
Like Josh said, if you're playing online, you probably should request interact privs on their topics- although there are freebuild servers you can choose from, as well (uplink.io, for one).
Also, as Josh said, you should spend a bit of time in singleplayer to get a feel for how the game works. This is actually the best part of minetest- you can modify the game to suit your needs by means of.... wait for it.... mod(ule)s! Some mods add
helicopters,
boats,
beds,
mobs and a temple,
and an entire wildlife ecosystem, with traders and all. There area also mods by paramat which add different realms, canyons, rivers, mountains and other details. It's a wild world!
Of course, when you play online, you're at the mercy of whoever's running the server. Still, online is one of the more fun things to do- and with Minetest, any player can also host their own server. We're mostly decentralized, except for the master server list, but even that is easy to fix: direct ip!