This is the 510th most frequent Turkish word.
yapmaya
"Yapmaya" means "to do" or "to make" (in the dative form).
In this sentence, 'yapmaya' indicates the action of cooking as the object of the decision made ('karar verdik').
Bu akşam arkadaşlarımla birlikte yemek yapmaya karar verdik.
We decided to cook together with my friends this evening.
In this sentence, 'yapmaya' signifies 'performing' in the context of executing the dance being learned.
Geçen hafta yeni bir dans öğrenmeye ve bu dansı yapmaya başladım.
Last week, I started learning a new dance and performing this dance.
Here, 'yapmaya' implies 'to do' or 'to proceed with doing' and connects to the act of working on a project ('projemizi').