Proofreading a Spanish text is not just focusing the grammar and the spelling. There is another important factor that you need to take into consideration, which are the written accents.
One of the basic rules to put written accents need you to classify the words into three categories.
Words called “agudas”
In these words the stressed syllable is the last one.
You need to put a written accent in these words when they finish in a vocal, or in “s” or “t”.
For instances: París, Colón, Jesús and Mamá.
Words called “llanas” or “graves”
In these words the stressed syllable is the second-to-last.
You need to put written accent in these words when they finish in a consonant different to “s” or “n”.
For example: Ángel, ábol or fácil.
Words called “esdrújulas” and “sobreesdrújulas”
In these words the stressed syllable is onte previous to the second-to-last.
These words always have written accent.
In the future we will talk about more rules for written accents in Spanish, but from now, try to don’t skip any of the ones commented above.