Cryptocurrency possibility...

I'm not expert in cryptocurrencies but I am interested in it, I am also claiming and mining cryptocurrencies..

I have following doubts about the Crypto currency, if some one could help me in solving them- 1. Like while issuing currency in the market Government keeps that much amount of Gold in the Mint to maintain the actual value of the currency issued. Is there any thing like that pertaining to this monwy. 2. Every currency is guaranteed by the Government of respective Countries and promised to pay the bearer amount mentioned on that currency note! Here who is guaranteeing the Bit Coins? 3. Actually people are seen in trading the bitcoins but at the end who will take the responsibility if all of them want to sell back the bitcoins? 4. why bitcoins are not accepted as official currency in most countries? Thanks @pearlrosa !

I was claiming from faucets, and now I have started investing to earn bitcoins and Ethereum.

My best answer to your questions is TRY USING IT. You can't understand it fully if you do not use it. Bitcoin Wallets are only similar to PAYPAL. I use CryptoCurrencies as alternative to USD/PAYPAL. It is NOT all about mining, trading, investing. We can simply use the REMITTANCE SERVICES. Blockchain transaction FEE and PROCESSING is CHEAPER and FASTER than USD via PayPal or Bank Wires etc. I earn a good amount of Bitcoin thru BLOGGING. There are many paying sites/apps that pay or accept Bitcoin payments. Just like USD/PayPal, we can convert Bitcoin to fiat currency and transfer to VISA/MASTERCARD, Bank Accounts etc. and use it anywhere Visa/MasterCard is accepted or withdraw in LOCAL CURRENCY. If you are in the USA, the best Bitcoin wallet for you is Coinbase.com (similar to PayPal but exclusive for CryptoCurrency) for buying or withdrawing Bitcoin to USD. In the Philippines, we have Coins.ph for PESO withdrawals. In Malaysia, they have Coins.my. UK has WirexApp.com etc etc.