[MrJohz]

You probably don't want a reference field in a struct, at least to begin with. It's a lot easier to reason about structs if they contain owned data only, and you take a reference to the entire struct. There are some specific cases where it might be sensible, or even necessary to do that, but for someone who is still learning lifetimes, these cases are unlikely to come up.

I recommend reading Steve Klabnik's "When should I use String vs &Str?" post, which is generally good advice when deciding between owned data and references. The "Level 4" section covers the case of references in structs.