Preview, the preinstalled built-in PDF reader on macOS is a separate app from Adobe Reader.  Adobe Acrobat is a paid upgrade to Adobe Reader adding extra features that require a paid license.

Preview supports many paid upgrade features in Adobe Acrobat.  For example, deleting pages, creating PDFs from multiple files, etc" - some basic information here:  & - table of contents shows other information and features.  I can coach you on the use of these features as desired.  Just let us know

Since show is often better than tell I've recorded the following how-to video that I recorded for another user on a similar discussion:  In the recording I get into a discussion of annotations and how that works best when sharing with Windows users (versus macOS user).