With keywords there is NO room for error, because the competition is VERY HIGH.
This of keywords as a spectrum, the top right contains TONS of traffic but also highly competitive, such as the keyword, “Weight loss”.
The very left, contains easy keywords to rank for, but with no or low searches. So competition is low, but traffic is ALSO low.
Either way, is a waste of your time.
What you want to focus on, are those secret, hidden keywords in the middle of the spectrum.
Those that have HIGH searches, BUT NO competition.
These are called, Golden keywords.