Google Keyword Planner, Google Search Console, Google’s autocomplete predictions are pretty much everything I use and need.
The best free tool is Google search itself. To find long tail keywords, simply type in your niche keyword followed by the letter "a", and then "b", and so on. You'll get search suggestions straight from Google. These are commonly searched long tail related keywords. You can also check out the Google People Also Ask section for keyword and article ideas. If you click on one, more will expand. You should be able to get dozens and dozens of article ideas directly from Google without resorting to paid tools.
You can also use Ahrefs free keyword generator , it is quite powerfulor. Or use Semrush free account, the few tries they give you a day is more than enough. I’ve got about 80 keywords saved using their free tries. They are really life savers.
If you are new to SEO and have low budget, you can still consider using the paid packages of Ahrefs or SEMrush to obtain better keyword research results. You can looking for shared or group buy account . However, please note that these group-buying packages have limitations and may not offer unlimited usage.