Here's my correction: - - - - - Is this written well? Hello teacher, My name is Carmen Alea. I am eighteen years old and I live in Chia, Colombia. I study food processing at SENA. I like listening to music and cooking, and I hope to learn a lot in this course. Thank you for your attention. - - - - -

thank you

The biggest single problem with what you've written is that you need to break it into separate sentences. Peachey's example shows exactly how. One thought, one sentence. When you've finished the thought, end the sentence with a period (punto, dot). Then begin the next sentence with a capital letter.