The points guy is a bad place to do research. His point value comparison chart is good, but he gets paid to shill cards so his recommendations are biased towards making himself money and not to providing the reader with the best information.
doctorofcredit.com is a smaller site, but it is the most trusted place to get unbiased reviews about all things credit cards.
In general the most valuable thing is to constantly sign up for new cards and get the new card spending bonuses. This page has that info:
https://www.doctorofcredit.com/best-current-credit-card-sign-bonuses/
For everyday cards you should get no less than 2% back. I use both the citi double cash and capital 1 venture x for 2% back on everything. I also use the costco card for gas at 4%.
The most valuable perk to any credit card is easily the southwest companion pass. It's basically unlimited buy seat one and take another person free flights for 1-2 years. There's no blackout dates, and you can use the companion pass both on cash flights or flights booked with points. It's not exactly a perk just for having the cards, and you do have to get the signup bonus from two cards (with one being a personal card and one being a business card) to earn the 125,000 points in one calendar year to get the companion pass. It's best to get the cards signup bonuses in January because the pass expiration is also based on calendar years.
After the companion pass, I would just follow doctor of credit to see the next best card signups. One thing to keep in mind if you get really into it is that Chase will not give you any new cards if you've signed up for 5+ cards in the last 24 months across all banks. Chase also has a lot of the best bonuses, so it's best to get theirs first if you are going to really get into it.