Checks are the individual tests that Silktide performs on a tested website. For example, 'Check and fix misspellings' is a check that happens inside the Content module.
You can find a complete list of checks for a website or section from the website report overview screen, or a list of all checks across all tested websites that you have access to from the Tasks screen.
You can also find a list of checks for a specific module such as Content or Accessibility by selecting the module name inside your website report, then selecting Checks from the navigation menu on the left.
Checks are ordered by priority in the checks table, with the highest priority checks appearing at the top of the list.