What cashback credit card is recommended?

What cashback credit card is recommended?

Alliant Cashback Visa Signature offers 2.5% back.
Citi Double Cash which gives 2%.
Discover It gives 1% cashback + 5% rotating categories (and the total cashback is double the first year)
....
There are also cashback sites/browser extensions such as BeFrugal (discussed in training), Rakuten...to further extend your cashback.

There are many other options as well.