Google Keyword Planner inside of Google Ads is one of the best tools out there to help you create Google ad campaigns and also to help you with your SEO. The problem though with the Google Keyword Planner is that for certain industries and for certain keywords, Google don't show you the volume at all. The industries are the different type of keywords that Google don't show any data for is primarily medical, anything at all relating with kids and also sensitive data.
Take a look at this, for example.
We just signed up a chiropractor who works in the United Arab Emirates. Usually, as in the keyword planner, you'd select the country, you put in your word and you press enter. But take a look at this.
Google have hidden all the data from us.
Luckily, we have paid tools. I've a hrefs and I have Semrush. You can see when I put the data in a href and Semrush, I get a whole lot of data with it.
What I'm saying is that in certain industries and for certain different type of keywords, unless you have paid for tools, you're really gonna be in trouble and you can't just rely on the Google Keyword Planner.