You just have to securely store the seed. All your private keys will be recovered when you restore your wallet with the seed phrase.
It's simple to secure wallet, so there is no essential requirements to own hardware wallets.
--snip--
Simple? Then why many people lost their coins because these reason :
1. Social engineering attack, which usually leads to download fake wallet
2. Neglect to update their OS/software, which usually leads to hacked computer
3. Choose wallet with poor security or buggy, such as Jaxx
3. Don't have forget common sense, such as open unknown links