How to calculate the price?

I am an investor in many things, stocks, art, bonds, etc. And I was wondering how people calculate the value of a coin? Take a stock, technically a stock has a “true value”, which can be calculated simply by (all assets + all future profits) / shares issued

So how would one calculate a value of a coin? For me it just seems that there is no true value of a coin and its just depending on the hype? How do you guys calculate a price target for your investments?