Sus libros están encima de (on top of) la mesa.
El is singular and masculine and los is plural and masculine while la is singular and feminine and las is plural and feminine.
I hope you have the idea now.
In Spanish all things have a gender is a little confusing.
Answer:
Learn the letters, punctuation, and numbers.
Explanation:
Those are some of the basics. Later, you can move on. You can use sites, like Duolingo, Babbel, Rosetta Stone, and more! Hope this helps!