Learn Swedish: Han älskar henne mycket.

Just like in English, we use a different word when someone is receiving the action. hon is the subject pronoun meaning 'she'. Because she is the one being loved here, we use the object pronoun henne, which means 'her'.

Can I change the order and say Han älskar mycket henne?

No, Swedish word order requires the object pronoun (henne) to come right after the verb (älskar). Words that describe the degree of the action, like mycket (a lot / very much), come after the object.

Does mycket mean 'very' or 'much'?

It can mean both! On its own, mycket translates to 'much' or 'a lot'. In English we say 'very much', but in Swedish, just adding mycket at the end of the sentence is the most natural way to express this.

Is älskar only used for romantic love?

No! Just like in English, älskar can be used for romantic love, loving your family, or even strongly loving things like a hobby or your favorite food.