The safest way to store Ada is a hardware wallet.
See: https://en.wikipedia.org/wiki/Cryptocurrency_wallet
They will be available soon for Ada:
See: Comparison of Ada wallets and exchanges
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There are many Cardano wallets. It is important to choose the best and most secure wallets. Some of the best Cardano wallets are - Daedalus wallet, Infinito Wallet, Atomic Wallet and ADA wallet Ledger Nano S.
The cardano wallets comparison gives a clear picture to select the secure wallets.
What about Yoroi? Rubbish post linking to rubbish article.
Comprehensive comparison: https://cardanowiki.info/wiki/Comparison_of_Ada_wallets_and_exchanges
Daedalus is the official wallet for ADA cryptocurrency, which is an open source software, which is available for Windows and macOS.
There are other cardano wallets like - Infinito Wallet, ADA wallet Ledger Nano S (upcoming wallet), Atomic Cardano Wallet etc. Check here for all the latest cardano wallets 2019 -