It’s a mini game -

1st one you are basically playing Simon says with its actions ( left roll, back flip, 180 turn, right roll ).

2 game is like the oasisaur (you fly around trying to avoid taking damage while dealing damage) easy way to do this is to kite all the argies and pteras into one group while maintaining distance. Use toothless’s charge attack for the fire balls hitting them all at once and you should complete that game quickly

3 (travel in a short time) fly high up into the air and nose dive. You’ll complete this easily

4 make sure either kibble or mutton is on the last box of your hot bar to feed it its taming food. Then rinse and repeat until it is tamed