Organizing posts can be done in an easy way if you use categories and tags. Let's see the difference between them.
Tags and categories refer to standard functionality offered by WordPress. Tags allow to highlight the most important key words, that can simplify the search (if used for any tag cloud) or simply distinguish the projects.
Categories and tags can be added and settled on each post when editing it:
And in separate tabs under Posts:
Posts categories can be found in settings of Post Types shortcode: