Now what should i do as a newbie and howto get bitcoin BTC ?
Welcome to the bitcoin, you can start with buying the bitcoin now if you have funds, if you're not have it i suggest you can go with join the airdrop / bounty but with your rank now it's hard to join them. But just patience for 1 month to reach jr.member rank then you can join with them.
I agree with you, before I say welcome to bitcoin. if my experience, I will pursue the rating first to raise it after the rating is parallel we join the signature campaign and other projects to get the coffers we want.
First try to understand the logic of bitcoin and blockchains. Then read many sources to understand exchange mechanisms. Then try to take a look at trading activities and trade on your own to make profit from the market.