The price of cryptocurrencies basically follows the rules of demand and supply. As the coin becomes scares it becomes more valuable and hence the price increases. One common mistake most investors do is that, once they see the price of a coin is going down, they hastily dump what they also holding which increases the supply more than the demand and further reduces the value of that particular coin. Later we try to put the blame on the team that they are not managing the project well. Let's help sustain our coins by avoiding panic selling. Its a collaborative effort.
crypto is basically the same as an item, if the market demand for goods is high, especially if a small supply of prices will be high but if market demand is low, of course the price will be low, especially if the supply is very large and I think this is an important thing we must use to choose Which coin is good