I would suggest to watch a YouTube video/class about that topic before reading it in the book. I hope that this technique works out for you.

Have you tried using YouTube to learn different topics?

You can also set a custom ringtone on iPhone for free. It’s just that, it’s a multi-step process and you need the GarageBand app.

https://support.apple.com/en-us/120692

In my country, it’s $1.5. So I am paying so that you guys can get videos for free.

Don’t give them more ideas!