To store cryptocurrency, I chose the bitcoin wallet BitcoinOfficial https://bitcoinofficial.org . I read good recommendations about him and I can say that he fully justified himself. The wallet is convenient and simple enough to use, so even a beginner can figure it out. What do I like best about free and yet really reliable. You do not need to download it and it is very convenient tode, while no one can block your account.

Does it help to exchange cryptocurrency safely?

Do you mean an exchanger or a cryptocurrency exchange? I want to advise you on Crypto-exchange, which are recognized by all owners of cryptocurrencies in the world. This information will give you the opportunity to learn how to work with the exchange and multiply your cryptocurrency without making much effort. Believe my experience, you should try it.