Bitcoin wallet security depends on the security level of wallet provide service. You cant do anything to secure your wallet, You can just find the right set of wallet provider who follows best of security practice.

Go with the trusted name in industry.

Bitcoin has been declared dead 273 times since December 2010, according to a tally by the people at 99Bitcoins. (That includes 174 times in 2018 alone)

For the best security, you require cold storage. Cold storage in the blockchain realm simply means a device that is disconnected from the Internet. This is the toughest security measure possible to safeguard any crypto-investment from the prying interests of hackers.

There are several new technologies which (hopefully) will reduce fees in the near future. In the meantime, don't use coinbase. They have terrible practices which inflate fees and on top of that they appear to jack up transfer fees charged to users and pocket the extra. Short term you can transfer your funds to gdax and send from there for free. Long term, consider a different exchange.

I think cryptocurrencies are here for long because of the technology behind it, Blockchain. I may not bet on a particular currency but this technology is just emerging and I believe that it will be here for long.

Blockchain is the technology which has potential to change many industries like banking, cybersecurity, education, networking, real estate etc.

Nothing, per se.

However, like so many other things that have been banned, yet are difficult to enforce, such bans would likely simply be ignored.

No longer having government-sanctioned access to cryptocurrency exchanges, and so on, might be inconvenient - but - due to the nature of cryptocurrency and its underlying technology, government bans might actually increase its usage and strengthen its adoption.

Especially in parts of the world where the local currency is neither strong nor stable.