I’ve tried to figure out the help I need teaching other topics but I am getting desperate, hoping for some help with the below

CSS Help:
1. Centering the logo on mobile. Code I have found on other support topics did not work. 
2. Social icons in header navigation are not functioning correctly (tested on safari). The mouseover effect appears to show 2 logos at once, instead of one swiping away to reveal another. 
3. Tweak Page Header text so it doesn’t scale so small on mobile. It scales to the size of the body text basically, it needs to read bigger. Code I have found on other support topics did not work. 
4. Hide the author but NOT the date on the blog feed. Have only been able to find code that hides both author and date (currently active).
5. Adjust font/font style/font size of “Categories” text above each blog post in the blog feed.  

Questions I have:
A. Is a parallax effect possible the navigation image background workaround I currently have in place?
B. Currently I am “faking” a continues blog feed that is Masonry mixed with Standard to pull out 3 featured posts, utilizing the post offset setting. Is there a way to sticky posts so that they only show up in the top 3 post areas in the Masonry area, but not be sticked in my Standard area?  

Thank you for your help!