Hi again, Dien.
In addition to the link to our Themer’s Guide that I provided to you previously, please reference https://theeventscalendar.com/knowledgebase-category/change-terms/.
An easier way to “remove” something is to “hide” it via CSS.
For example, to answer question #4:
body.post-type-archive-tribe_events .tribe-events-list-separator-month { display: none; }
You can add custom CSS code via your child theme’s style.css file or via a plugin like Simple Custom CSS or, my favorite, Jetpack. Jetpack supports regular CSS and the LESS and Sass pre-processors.
If you’re not a CSS expert, Jetpack’s Custom Design reference may prove helpful.
Please let me know if any of your questions aren’t answered.
P.S. Please note that we are limited in our ability to assist with customizations by our Scope of Support Terms.