For now, you can (usually) add Negative keywords to carve out most of the things you're likely concerned with.
But as Automation grows, both Positive and Negative Keywords at Google Ads will be sunset in the coming years (or months).
They'll collapse match types further, reduce Search Term and Keyword level reporting further, sunset campaign types that have many levers, and more.
In 1-3 years, it'll be pretty lever-less.
Once the levers are gone, the MOST important thing you'll be able to impact is your feedback loop (aka tracking).
Start heading towards more sophisticated tracking now.
On March 14, 2019, G fired this warning shot, to let you know it was coming:
[
agency.googleblog.com...]
Note: That was also the last post G put up for ad agencies... ouch. A few months later, they pulled support for agencies. A few months ago, they collapsed Phrase and Mod Broad into a single Match type, reducing the count of matches from 4 to 3... more to come. Buh bye levers!