Which is the best SEO tool for regular use…
Welcome to the forums, @sarwar. 
Why don’t you get the discussion started by telling us which tools you use, and why?
To all posters:
A list of tools with no comment or explanation is of no interest to anyone. By all means share your favourite tools, but please take time to explain briefly what you use them for and why you like them.
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Not to mention what part of SEO you’re trying to focus on. “SEO tool” is a very broad category…
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For what SEO part do you want SEO tools?
Like for SEO, SMO, SMM or content creation or validation or competitors analysis?
or daily ranking tracking.
Hello,
I use SEM rush on regular basis for the competitive analysis. I also use Google analytics to know about which campaign is driving more relevant traffic to our website.
I’d like you to be more specific 
Or you can even share your favorite SEO tools! It’ll be a great help for everybody. Personally, I like to always ‘improve’ my SEO tools and I even took some courses for that. It came as a surprise to me when I saw something like this exists, haha. Once I did a 2 weeks course on this that really helped me improve my skills. Anyway, I use different websites to show me the metrics and anything that can be relevant for my work. Unfortunately, I can’t give you details because they are confidential as I work in a Guest Post Service Agency. I hope you understand that. I was doing this on my own at first but it was too hard for me to find clients. Maybe you can share some tips on that 
i am using keyword planner tool for SEO and ASO both. since it is free that’s why.
As the OP has never returned to this discussion, there seems little point in reviving it now.
Thanks to all who contributed. Thread closed.