As you've been reading the Psalms, you may come across some terms that will throw you off. Here's a quick rundown of some popular words:
Selah - while the exact meaning of this word that occurs frequently in the Psalms is unknown, it is generally thought of to be a musical notation instructing the musicians to pause or insert an interlude for the purpose of reflection.
Maskil - The meaning of this term is also debated, but is thought to be a label given to a psalm that was commonly used for teaching and instruction.
Miktam - Six Psalms contain this description, but there is almost no certainty on what it means. Your guess is as good as mine!
Hopefully this helps as you are in the Word this summer!