Buy a ticket to go up to the top of Borobudur, luckily I ordered it here, because if I ordered it directly on the spot, it turned out that many people didn't get the quota to go up to the top, so it's better to buy it here.
The ticket includes a shuttle ride from the entrance to the temple area, and vice versa. It also includes sandals to go up to Borobudur (upanat) to keep the temple from wearing out. The ticket also includes a tour guide who will give directions and explain the story of Borobudur.