Athena theme- Menu and blog customisation

I have very basic skills in HTML and CSS, and need help with a few points regarding customising the ‘Athena’ theme on the website dayanitasingh.net:

1. While the font size of the menu on the homepage can be adjusted, the pages that are under each of the menu item, show in a larger size than the menu. How can I adjust that?

2. The footer is automatically taking the primary menu, even though I haven’t selected my Primary Menu for footer. I don’t want that. I don’t want any menu in the footer.

3. Can I make the blog headings of a different font than the rest of the pages?

4. In the blog I do not want the ‘continue reading’ tab and instead want to be able to insert ‘read more’ wherever I want in the post.

Please reply with suggestions.
Thank you!