What do you need to prepare for Changsha to go to Tibet in June? I'm going to join the group, just one person, but I haven't found the group yet. ...

Sunscreen, and some to prevent altitude sickness. You can eat some rhodiola recently. Although it is June, I don't know where you will go after you enter Tibet. If you want to go to the snow-capped mountains, you'd better take some cold-proof coats and sunglasses. It depends on where you go to Tibet. You can buy it in Lhasa after you enter Tibet!