The word "jalapeño" should be capitalized only when it is the first word of a sentence or part of a title. Otherwise, it is generally written in lowercase, as it refers to a type of pepper. In formal contexts, when referring to the specific variety, it is also acceptable to use the accent mark over the "n" (ñ).
Have should be capitalized if it is the beginning of a sentence. Summer should not be capitalized.
It should only be capitalized if it forms part of a title.
Yes it should always be capitalized.
Yes it should be capitalized.
As an abbreviation it should be capitalized.
No it should not be capitalized.
The first 'c' should be capitalized.
Yes it should be capitalized.
Yes, it should be capitalized.
No. It should not be capitalized.
"Western" should be capitalized and "world" should not.
Yes it should be capitalized.