Keyword planner is the best tool for choosing keywords based on localization.

I need high DA and PA websites to post guest post in them

do you have any?

Google Keyword Planner is the best keyword research tool.

I think Google Key Planner is good enough. If you want to see which keywords your competitors' are optimizing for, you can use Ahrefs and Semrush as well.

google keyword planner is best to search keyword.

I think Google Key word Planner , Google Trends , Keyword Tool.io

My vote is always for Google Keyword Planner. For Amazon, our tool SellerPrime helps you to find the best dominant keywords.