OP I believe you are still doing your research, and hence, you are asking this question,n but it is not bad to ask because the more you ask, the more you know and let me just say this that these two factor greatly influence bitcoin value and price and they are scarcity and demand.
Scarcity in the sense that there are only 21 million bitcoins as total supply and can not be minted. 19 million already in circulation and 1milion still not in circulation, and from this 19 million, some already lost ie, the owners lost the keys to the wallet holding them, etc.
Demand in the sense that the adoption rate is fast increasing, and this would cause an increase in the price and value of bitcoin as people already begin to accept it as a legal tender, etc.