What’s the difference between a reflexive and intensive pronoun?

There are a few types of pronouns, among other there are reflexive and intensive pronouns. Every website I visit, they give me the same examples.

E.g. Found on Grammar Monster:
• Reflexive pronouns (e.g., itself, himself)
• Intensive pronouns (e.g., itself, himself)

What is the difference?

Solution 1:

[1] Ed hurt himself.

[2] Ed himself designed the house.

Reflexive pronouns have two main uses:

a complement use where they are obligatory, as in [1], and an emphatic use where they are optional, as in [2].

It's the latter use that is sometimes called 'intensifying'.