Decentralized Exchanges plus ledger nano is a new system like wallet and this is how we can avoid from hacker and this may heps from many frauds & we all know based on bitcoin the probability of hacking account is near 0.2% so still use in a safe way is good for use.
No, I have not done this ever. There are always some unwanted coins in all wallet. So as I also have some. But I didn't feel to burn it because I have no time to spend behind them.
there are so much helping tutorial in youtube, you would be able to see by your eyes and if you like to read, why don't you go for those free crypto courses man, those are cool
Yes, it's kind of difficult of you want to spend cryptos for daily activities. You have to at first exchange it to USD and then into local currency. I think , in near future all these hassles would reduce a lot.
I think Facebook took a good attempt towards cryptocurrency. There are millions of users of facebook . Itroducing blockchain system over here would prove to be quite profitable.