Does it make sense to make ad groups for Adwords according to the principle 1 key = 1 ad?

Question

contextual advertising

Does it make sense to make ad groups for Adwords according to the principle 1 key = 1 ad? If so, do you need a cross-backing track?

Answer 1

Yes, there is also a quality score and ad relevance is taken into account.

Answer 2

Yes! If your key is contained in the title of the ad, it will noticeably increase in quality, which means your ad will be able to get to higher positions, and pay less per click)