Is there a wallet we can use to store Bitcoin and all other assets such as LTC, ETH, DASH, DCR?
I recommend coinbase it is safe to store your wallet and this wallet have ethereum wallet also but they dont have LTC, Dash or even DCR. I store my LTc and dash to the exchanges site like poloniex and bittrex . I dont know what is the name of wallet of that coin. BUT I THINK THEY HAVE APP FOR THAT YOU CAN DOWNLOAD THAT ON PLAYSTORE.
Coinbase just added Litecoin. You can store Bitcoin, Litecoin and Ether there.
Regardless, it's not a good idea to hold a lot on an online wallet and even worse to hold it on an exchange. Jaxx is good since it's a proper wallet where you control your keys.