A versatile word built around the core idea of "more"
Encoding Strategies:
repetition

The most useful translation for más is more, because nearly every way it's used is just saying there is a greater amount of something.
más
more, -er
A greater amount of something — whether it's a quality, an action, or a thing.
- Necesito dormir más = I need to sleep more
- ¿Puedes comprar más leche? = Can you buy more milk?
- Es más rápido que su hermano = He is faster than his brother (more fast than his brother)
most, -est (superlative)
With the definite article, more becomes most — the greatest amount out of everything being compared.
- Es el más alto de la clase = He is the tallest in the class (the most tall in the class)
- Es la que más trabaja = She is the one who works the most
else (with pronouns)
With pronouns like quién or algo, you're asking if there is anyone or anything more beyond what's already accounted for.
- ¿Quién más quiere? = Who else wants some? (who more wants some?)
- ¿Algo más? = Anything else? (anything more?)
plus (math)
In math, adding a greater amount to a number is just adding — plus.
- Cinco más dos son siete = Five plus two is seven (five more two is seven)