The best keyword research technique in SEO?
There isn’t one.
But there’s the best approach to keyword research even if you are a newbie in the SEO industry
Technique combining.
So, if you can:
- Use SEMrush to find keywords your competition ranks for.
 - Use Ahrefs to find content gaps to fill.
 - Use Moz’s Keyword Explorer for complete topic coverage
 
Then you’re set.
And when you throw in good ol’ Google Suggest and Keyword Planner, then you’re rocking a near perfect keyword research strategy.