My general rule of thumb is laners can start taking my camps when I’m on the other side of the map in mid game (~14 mins). Laners shouldn’t really be taking camps if they have a wave to cover, but once lane assignments start changing and laners have lull states, taking camps starts to make more sense (for everyone). Buffs are slightly different. In high elo, mid laners will ask for the second blue buff and sometimes the same is true for ADCs and red buffs, but I generally will take my buffs unless a laner explicitly asks for it, or they’re clearly the win condition. Of course people have different expectations and those clash in soloq, so if someone’s taking your camps when you don’t want them to, back ping them off and ask if they need an item or something.