Learn Spanish (Spain): Siempre me peino en el baño. - I always comb my hair in the bathroom.

Peinar means "to comb." When you perform an action on yourself, like combing your own hair, Spanish uses a reflexive verb, peinarse. The me is a reflexive pronoun that shows you are the one receiving the action: "I comb myself."

The translation says "my hair", but I don't see the Spanish words for "my" or "hair" here. Why?

In Spanish, when you use a reflexive verb for a daily routine, it is usually obvious what body part is involved. Me peino essentially means "I comb myself." You do not need to add mi pelo (my hair) because the "my" and the "hair" are naturally understood from the verb itself!

Could I attach the me to the end of the verb, like Siempre peinome?

No, not in this sentence. When a verb is conjugated (meaning it has been changed to match the subject, like peino for "I"), the reflexive pronoun me must go directly before the verb.

Does the word siempre have to go at the very beginning of the sentence?

It is very common to put it at the beginning, but Spanish word order is flexible! You could also say Me peino siempre en el baño or Me peino en el baño siempre and they would all mean exactly the same thing.