Change font & background for Data & Pricing tables

Hi guys. I know you get these questions too often. I was searching in the forum, but found no clear solution of how to change a particular column’s or cell’s font or background. Hopefully you can simply refer to this post in the future, without having to write many custom answers:

I. Data Table Contents
1) How to change in one particular page (.page-ID-xxx):
in the second table (from top/from left) out of three tables in same page:
background color of:

a) row nr 3 and 6 from the top (full code here …… for this particular change only)
b) column nr 3 and 6 from the left (full code here …… for this particular change only)
c) single cell in row nr 5, column nr 5 (full code here …… for this particular change only)

2) in the second table (from top/from left) out of three tables in same page:
font color, weight, style, size and alignment of:

a) row nr 3 and 6 from the top (full code here …… for this particular change only)
b) column nr 3 and 6 from the left (full code here …… for this particular change only)
c) single cell in row nr 5, column nr 5 (full code here …… for this particular change only)

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II. Pricing Table Contents

Exactly same question, but for Pricing tables instead of Data tables.

Thanks a lot guys for putting up with as newbies..