ahrefs and askthepublic are my goto.
If you are looking for keyword ideas and trying to build a tropical authority goto google, type your main keyword and just enter your main keyword and put a asterisk (*) after it different alphabets, for example:
keto diet *a
keto diet *b
You will get n number of keyword ideas and what people are actually searching.
PS: When trying to create a tropical authority search volume doesn’t matter.
Google Keyword Planner. This is by far the best tool with the right accuracy of keyword volumes and bids. I have also used Semrush and Ashref to find the paid keywords of my competitors.
For Finding & Planning: Google Keywords Planner and Google Trends
What am I currently missing: https://seositecheckup.com/
Competition Keywords: Semrush
My current SEO performance: Google Search Console
Hope this help!
I use AnswerThePublic.
I think it is very good because it allows you to search phrases or keywords in Google, Youtube and Bing.
Other features are very useful:
-Search by country and language
- Every keyword or phrase contains a search link that takes you to the tab to start getting more and more into what people are looking for within a specific topic.
- Metrics that measure Search Volume and CPC.
- All searches contain questions, prepositions, comparisons and alphabetical order giving you a wide variety of phrases and keywords.
I love this resource because they also give you up to a certain amount of free searches per day so you can give it a try anytime.