Im my logic after the segwit bitcoin will go down, so it is probably time to sell. But i would keep it whatever happens

For ethirium its Myetherwallet, for waves - waves. Also jaxx is good.

It is really hard to call bitcoin as a currency. Just because the price of it goes up and down every week so critically. You can not really operate with the currency with such a difference in value

I would say that better is use altcoins, but we should use bitcoins because it is like a gold in the cryprto currencies world. It also gets more valuable from month to month

I think it is gonna have a value not less then 30 000$ maybe more. Some experts predict that bitcoin is going to worth 100 000$ in 5 years

It depends how old you are. Probably if you will safe 1 bitcoin for your children and let us think that its gonna be in 10 years, probably it will get you lots of money.