What do you need to donate to the altar? (Valheim)

If he is the first one that you found, then most likely 2 Aleon's heads, these are the trophies that fall out when they are killed, then a barefoot deer will appear, kill him, get a trophy from him and him with a recipe for a Pickaxe, you can chop tin and copper with a pickaxe, and you carry his trophy to the place of your birth, go to the deer stone, put the trophy on the button from 1 to 8, point the cursor at the hook on the stone and hang this trophy there, after which you will be given the strength of a deer, which spends less stamina on jumping and whatnot something

1 boss deer - 2 deer heads
2 ancient bos - 3 ancient seeds (in the nests glow purple in the dark forest)
3 boss mass of bones - 10 dried bone (in crypts in the swamps)
4 boss moder - 3 dragon eggs (in dragon nests in mountain biomes)
5 bosses - 5 totems (in goblin villages on the plains)