can have several different meanings in Japanese, depending on which part of the sentence it is in, and what comes before/after it. It is often translated as ‘because’, or ‘since’. In these cases, it just means ‘Because of (A), (B)’.
Since I ate so much ice cream yesterday, my stomach hurts. (From that I ate so much ice cream)
Because she is nice, I like her. (From that she is nice)
may be used with almost any type of word, but when the nuance is ‘because’, it will require だ
before a noun or な-Adjective
Because it is a big company, there are a lot of workers. (From that it is a big company)
Since smartphones are useful, they are popular. (From that they are useful)
Despite having several different nuances, it may be easier to think of から
as meaning ‘from’ in all situations, as that is the base nuance.
From (A as a reason), (B) = Because/Since
From (A as a location), (B) = From
から is a special type of particle in Japanese called a 格助詞（かくじょし）. These are particles that describe the relationship that (A) and (B) exist in. We will learn more about these soon!