Yes.
All proper nouns start with a capital letter.
The words that should start with a capital letter are places, names, important words in a title, and the letter at the start of a sentence.
No Only names of people or places etc have capital letter at start
The letter C appears most, as it is at the start of both Capital and City.
Yes, all books start with a capital letter.
A common noun does not start with a capital letter unless it is the first word in a sentence.
Yes, "Best wishes" at the end of a letter should start with a capital letter.
3 European capital cities start with the letter R. Rome is the capital city in Italy. Riga is the capital city in Latvia. Reykjavik is the capital city in Iceland.
No
A capital letter
A capital letter.
Yes, we do