There are tons of ways to gain bitcoin some easy some difficult. Usually the easy ones don't really have a risk but return a low profit and vice versa for the difficult methods.
You have to look into trading if you want big profits, or of course IT jobs in the services section.

Indeed most stuff on the Darkweb is illegaly attained or is just plain out illegal (Think drugs weapons etc.).
So I'd be very cautious when buying items from the dark marketplaces or when even visiting them!

That's an interesting question because Amazon has some policies which counter with the system of Bitcoin so if they will accept it is hard to answer.
But they probably will if other merchants will do it as well so they are not behind their competition.

I'd say is it a lot better to invest money than to just save it and do nothing with it. I say this because there are save investments with a low return (Yet higher than any bank).
So putting your money into one of those investment instead of a saving account can make you a nice profit over time.

I also like bitcoin the most just because of the many ways to gain bitcoin and investment options. It's like this platform opens up so many (side)jobs as well as investing opportunities.
Gold is nice but just for saving not so much for making profit if you ask me.

Bank is way more safe than a bitcoin wallet but I like bitcoin wallets more because bitcoin wallets give more freedom.
So in the end I'd choose for bitcoin wallets cause I like my privacy and freedom more than the safety of a bank.

I think lots of people have lost bitcoin before with for example trading, trading is very difficult to master so the way to get experience is to do it of course. But doing it while low skilled will cost you some coins, in the end it's worth it though.