The use of capital letters (las mayúsculas) is far less common in Spanish than in English. Take a look at this summary of words that are capitalized in English but not in Spanish.
Estar is one of two Spanish verbs that mean "to be." Estar is used to describe the current state of a noun – temporary, changeable attributes.
The Spanish subjunctive is a special verb form, called a mood, that is used in dependent clauses to indicate some sort of subjectivity, uncertainty, or unreality in the mind of the speaker.
The Spanish letter C can be pronounced in two different ways.
Echar has numerous meanings and is also used in various idiomatic expressions.
Although normally prepositions are not used in front of direct objects, in Spanish there is a special preposition called the personal a which precedes direct objects that refer to people, personified nouns, and animals.
Titles like señor and señora are important in Spanish, and they are used somewhat differently than their English counterparts.