WHERE CAN I TRUST 100% TO INVEST MY COINS for garentee payback
CAN ANY ONE SUGGEST ME ?
Nothing in the world is guaranteed, especially when it comes to investments. That's why you always see or hear those disclaimers, investing is risky, you can you lose your hat yada yada.
I'd suggest first you read up and learn as much as possible about Bitcoin and Crypto in general, ask questions, then when you feel comfortable about the technology and ideology, only then should you consider getting involved.
Once you do commit, you'll have to take the proper steps like selecting the right wallet for you. If you plan to buy a large amount, meaning thousands of dollars, then best to get a secure desktop wallet with paper wallet as backup. You can download the client here:
https://bitcoin.org/en/choose-your-walletAfter you've downloaded your wallet on a PC with good antivirus and security software installed, you'll have to buy BTC from a trusted source like Coinbase, Circle, or from seller with high trust ratings on LocalBitcoins. After you transfer the purchased Bitcoin to your PC wallet, it's highly recommended to setup a paper wallet as backup, which you can do here:
https://www.bitaddress.org/Once you've secured your paper wallet in a safe or something like that, sit on it for 5 years, come back to it in 2020, and open your finest Brandy, Bourbon, or Scotch and pour yourself a glass. Open your safe, pull out the paper wallet, Sip your drink until completion, and good or bad just take it all in. You'll know in 5 years if it was worth it.