Google is good but only provides 100 keywords. Wordze provides up to 10,000 keywords. (But you have to pay)
The Google Keyword tool is of course the best, but you can also try Wordtracker Keyword tool. Good Luck!!!
A lot of keyword tools are there, easy solution is that you can open 5 to 6 known keyword tools & Google keyword tool and search a few same queries at the same time on all, check the difference of data & monthly searches. You will have a great idea, that which keyword tool is better than the Google Keyword tool. Personally, i use Google Keyword Tool along with it, i use the Semrush keyword tool, its the best SEO tool. Neil Patel's ubersuggest is also a very good tool. Then few other keyword tools like kw finder etc, but top on list are Google Keyword Tool, Semrush Keyword Tool & ubersuggest.
Google keyword planner is the best free SEO tool for keyword research, If you want to use the paid tool then you can use the Ahrefs tool for keyword research. You can use keywords everywhere chrome extension, KW finder tool, Google Trends and answer the public.
your google keywords are : lots of keyword planner tools in google search engine but mostly accurate google planner tool it free to use
There are many kinds of keyword suggestion tools available, but we cannot say who is providing the right information. But I would like to suggest a few keywords tools where you will be able to get good keyword ideas from those platforms. Those keywords tools are keywords planner tools, Ahrefs, and SemRush.
Just in case you want to investigate competitor subdomains. tools like seobility help you investigate competitor