Is there a wallet we can use to store Bitcoin and all other assets such as LTC, ETH, DASH, DCR?
I do not think there is a wallet that is as full as you want. Most bitcoins do not accept any other currencies. So, if you want a wallet like that, I'm afraid that's hard to find. However, we can use the trading platform, it is definitely a versatile wallet with all currencies, and of course everything is easy.