The first reason for any site’s rise in this spam score is due to spammy links and if your site has less-quality backlinks, then there is a chance of a high spam score on...

100% right. If you don't have a large number of such links, don't worry about such links.

Provide a link to your website. The absolute basis is a fast and optimal website with well-written texts.

This link might help you, https://moz.com/blog/new-website-seo-strategy

I just checked with few keywords and found blogspot.com blogs are ranking in Google. If your blog on blogspot.com is not ranking then just optimize it in better way for s...

Reduce the bad backlinks to the website is the way to reduce the spam score. Easier way is, disavow the list of bad links using following link. https://search.google.com/...

There is no need to worry for bad backlinks anymore. Google has started to ignore the bad links while considering ranking. https://www.searchenginejournal.com/google-dont...

These pages are useless log in pages.

@binayjha Many thanks for this !

You should not de-index the non-www pages of your client until the content on pages are objectionable or completely irrelevant to your website. Hope you can keep those pa...