Search for potential affiliates;
Check the quality of text optimization;
Check for the presence of phone and address;
Plagiarism on the site (non-original text);
Snippets in Yandex and Google;
Number of internal links to landing pages;
Number of duplicate links on the page;
Links to other sites;
Keyword stuffing in the text;
Keyword stuffing in meta tags and H1;
Excessive bold text;
Multiple repetitions of the same word in a sentence;
Bigrams perplexity in text and meta tags;
Trigrams perplexity in text and meta tags;
Spammy headlines;
Thin pages (with very little text volume);
Pages without outgoing internal links;
Check the relevance of queries to landing pages;
Pages blocked from indexing;
TITLE=DESCRIPTION;
TITLE=H1;
DESCRIPTION = H1;
Short TITLE, DESCRIPTION;
Number of indexed pages in Yandex and Google;
Blocked from indexing in Robots, noindex, nofollow, rel=canonical;
Presence of landing pages in sitemap;
Lost landing pages;
Change of landing page URLs;
Adult content on pages;
Negative content on pages;
Pages with text in noindex;
Similar pages.
Errors 403, 404;
Errors 500, 503, 504;
Unavailable pages;
Pages with frame/iframe;
Critical HTML errors;
HTML validation errors;
Multiple redirects;
Lost images;
Lost JS;
Lost CSS;
Lost files;
More than one TITLE tag;
More than one DESCRIPTION tag;
More than one KEYWORDS tag;
More than one H1 tag;
Extraneous tags in headers;
Pages with rel="canonical";
Domain glue;
Pages containing broken links;
Proper handling of 404 errors;
Pages without unique images;
Images with empty alt and title;
HTML optimization for mobile;
HTML size optimization;
Loading time;
Very large pages;
Sitemap validator;
Present in sitemap but not found during site crawl;
Present in sitemap but blocked from indexing;
Not in sitemap but allowed for indexing;
Identification of 26 types of errors in Robots.txt;
SSL certificate analysis (7 factors);
Presence of the site in blacklists;
Code error spikes;
Accessibility analysis from different User-Agents;
Accessibility analysis from different countries;
Presence of cloaking on the site;
Presence of search bot blocking;
Different server response for mobile;
Mixed content;
Links to compromised domains.