However, if possible, I would like you to expand a bit on your “zombie pages” tip..we run a site where are definitely enough pages to delete (no sessions, no links, probably not even relevant with the main theme of the site, not even important for the architecture of the site)..Nonetheless, I am not very sure what is the best technical decision for these pages…just deleting them from my CMS, redirecting (if there is a relevant alternative) or something else? Unindex them on Search console? what response code they should have? ..

Jonathan, when an Internet user searches through Google, then he enters, at that moment, his thoughts in the form of queries. For Google to analyze the query and display the results, there are rankings according to their own algorithms. However, Google also shows users the ads that are of interest related just to the users’ query. These ads at Google are called Adwords and they show an extremely high degree of success because they see ads directly related to the users’ query.
Ahrefs is a well-known tool primarily used for checking backlinks, but what most SEOs forget to take into consideration is that it is capable of so much more. With their massive data index, Ahrefs is definitely one of the most sought-after SaaS tools out in the market. Tools such as this helped eradicate the days wherein Google gets played by unethical, black hat SEO tactics.  They helped the industry turn for the better, and SEO has never been simpler. With the tools such as Ahrefs being available in the market, it became simple for us to get better at what we do.
Pros: SEMrush is a very effective tool for SEO. It has a simplistic approach and it allows users to see all the relevant data of any websites. It has a very detailed keyword analysis tool that can show many related keywords, traffic data and competitors. The backlink analysis tool is another great feature of this app. I can see all the websites that are linking to mine, their countries and IP addresses, their anchor texts and if the links are follow or nofollow. 

Semrush is one of the best alternatives for SEO and marketing research. The platform provides a wide variety of reports on almost all aspects of marketing: competitive analysis, rankings, link building, keyword research, site health, advertising and social media. And that's not even the full list! It's one of the best options for any marketer looking for an all-in-one marketing research solution.
Quick tip: While doing keyword research with SEMrush, do not select the keywords with search volume more than 1000 per month, as they require a lot of efforts to get required traffic for your site. Choose the keywords between 500 to 1000 per month search volume (or even below) so you can get top 3 or at least first page rankings even if you’ve a new website.
Ahrefs is incredibly comprehensive and straight forward. From keyword discovery to site audits I use ahrefs for all my SEO needs. It's the first SEO program I was introduced to when starting me SEM management career and has proven to be the best time and time again. I've used their competitors liker moz, SEM rush, and a couple other services- none of which have come close to stacking up.
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