can i invest 10$ BTC ?

Yes you can but the Traffic is not so good you need more invest

Making money with such a small investment requires a lot of research (or luck) in the markets and trading.

Answering the question directly - Yes you can. Things like the Cash App or even Coinbase allow you to. Can also buy offline from a Bitcoin ATM, etc.

Should you? Or how much? That's a different topic. But yes you can.

why not. use it as an experiment and see if its stable enough for u to trust it

you can buy steam key from g2a with 10$ bitcoin i think

invest Dash the best it will go up so there is an option to earn

Buy a cheap coin instead! you can earn much more!!! like ripple :D

Look up the Swipe Wallet ($SXP) I'm holding over 3,000 right now. My biggest investment so far.

You can always do it, but dont expect to go far with such a low amount investment, in a cryptocurrency that isnt so volatile