Yes, Egyptians should be capitalized.
yes
Egyptians gets capitalized wherever it appears, just like Americans, Italians, Chinese, Arabians, Iranians, Canadians, Polish, etc.
No, Egyptian is an adjective used to describe something of or from Egypt (a proper noun). Although Egyptian is an adjective, it is still capitalized.
No, seasons are not capitalized.
"Can" is typically not capitalized in sentences unless it is the first word or part of a proper noun.
No it's not capitalized.
No, keywords do not have to be capitalized.
No it shouldn't be capitalized.
Wikipedia is capitalized.
No, it is not capitalized.
Have should be capitalized if it is the beginning of a sentence. Summer should not be capitalized.
yes it is capitalized