hikebranding

Google wants to provide the best results to their users so if your website is mobile responsive Google will give priority to your website in search results. As a user it is good because I also don't like the desktop version of a website on my mobile. Yes, I'm agree with you that you will have some business if you are offering web design services.

There is no any free tool which will give you in-depth information. You have spend some bucks to get the best keywords and in-depth information.

If you want to write about any topic then you should have good knowledge about it. So I would recommend to choose 3-4 categories and start learning about them. Once you will have good knowledge about these categories then you will write the best content.

I've checked your website and want to tell you that please change the font (it is my view). Font plays an important role in increasing trust in the users. My other suggestion is to analysis the traffic like traffic sources. It will help you to identify the issue.

What type of error you are getting. If you will specify the exact error then I can surely help you.

I have not used the above tool yet. But I use Ahref site explorer, Moz and SEMrush for competitor analysis and backlink analysis. From my experience these are the best tools. The combination of above three can give you detailed information of everything.