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:

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And in separate tabs under Posts:

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You can implement such actions with Categories: add/edit name, slug, description and manage the hierarchy level. For instance, "post" category refers to parent "blog" category. Various notional connections can be emphasized in a such way:

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Post Tags settings don't have an option to settle parent tags, but there's one point you won't see on other mentioned taxonomy elements - Popular Tags cloud:

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Posts categories can be found in settings of Post Types shortcode:

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And on any blog page you have a possibility to select categories to be displayed (after blog page template is chosen):

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See more about Taxomony for Projects here - click to proceed,

for Testimonials - here.