Making changes to the site, working with the site code

Good afternoon.
In general, the required task is as follows: it is necessary to make a number of edits to the site on the content, namely categories, description, custom filters, ratings, interface and layouts of pages, the introduction of advertising banners (not Adsense)To begin with, read the package of necessary changes. At least tentatively (Tuskey will be clarified): https://docs.google.com/document/d/1spzsUXYdKpDiOg... Heres the site (on WP): https://indicatorspot.com/indicators/