How can i understand Bitcoin more ? I mean it has no use for it yet, it is not producing profits for companies ?
Bitcoin has already its use case. I do not know what are you looking for but Bitcoin is already been used as a mode of payment even though it is highly volatile. If Bitcoin is not producing profit for any companies then why does there are lots of centralized companies now that are taking advantage of Bitcoin? You can search the internet and you will find lots of Bitcoin start-up companies.
I want to invest good capital but dont understand why I would do this on something made out of thin air. Sometimes seems like its a lot of fanboys just wanting it to go up and up so they can then sell to retail
No one is forcing you to invest in Bitcoin. If you are hesitant then don't, it is your own free will. You may miss out on possible future profit, but at least you don't lose any money if the Bitcoin market crash.