Is it possible to mining BTCitcoin without any capital/asset?
Mining for free? That would be nice but I guess not.
It s possible to start slow, referral campaigns, signature campaigns, faucets, all this can generate some money to start but this would be a very difficulty way to start.
Signature campaigns is best option. Espicallly if member or higher rank.
As far as mining for free it is not going to happen. Ether buying miner or paying rental (higher priced) for hash. Also if you look into cloud it is very risky.
So yes you can get a little BTC for things you can do but no you won't be running a ton of hash for free.