The raspberry pi tutorial series is about creating an encrypted container on a PI that can store wallet files from different wallets. If you want to have all your coins in the same wallet you need to use 3rd party wallets and you have to rely on their security. I would not recommend that as some has been hacked/lost stuff. If you do I would recommend coinomi but that's a mobile wallet and I would recommoned mobile wallets only if you really need it on your mobile.
Thanks for mentioning typos. You need to be really carefull when you write your passphrase down. If you create such thing always make sure to retry to open it with your phrase and in a second opening round type very slowly.
RE: Encrypted Raspberry Pi Wallet - Part 2b: Let's talk about your passphrase