Best way to use Category & Custom Fields?

Sorry for a wrong answer.

It is posted in other question.

About your situation,

Heroes seem like Category(Custom Taxonomy)

Guides is a custom post (Custom post)

About Heroes Type, it can be a subcategory of Heroes or you can create new custom taxonomy for it.

In custom post, you just need to embed Heroes Types and Heroes if you have 2 different custom taxonomy.

More simple, you can use guides meta to save values (just like postmeta).

Taxonomy can be embed anywhere in any custom post. It depend on your idea and your data structure.

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