In Spanish, the days of the week are not capitalized.
Hoy es lunes.
Today is Monday.
To say on Monday or on Saturday, use el before the day of the week.
At the beginning of sentences, the letters b and v are both pronounced like an English b.
But in the middle of words or sentences, they often sound like a hybrid between b and v.
In Spanish, double l (ll) sounds similar to y in the English word “yes”, though you may hear some Spanish speakers pronounce ll as in “vision”, “shop”, or “jar.”
You've seen that when talking about people, the ending of an adjective depends on the person's gender. For example, Pedro es mexicano, but María es mexicana.
This applies not only to people, but to any noun!