Hello!
1. The first, last, and main words in a book title.
Pronouns do not need to be capitalized and neither does the last word of every sentence. "I" should always be capitalized, not only at the beginning of a sentence. In a book title, the first and last words need to be capitalized as well as the main words. This excludes words such as "the," "as," etc. unless they are the first or last words.
2. A government position when it comes before a specific name.
A government position when it comes before a specific name should be capitalized because it is a proper title. The time of year does not need to be capitalized if it is used in a general way. The last word in a narrative sentence never needs to be capitalized, and not every word in a book title always needs to be capitalized.
I hope this helps you! Have a lovely day!
- Mal