To be brief, create a wordpress widget at the sidebar.
It will have checkbox for each and every category.
Case0: never tick any box
Result0: Show all posts
Case1: tick 1 box[blue]
Result1: Show all post from category blue
Case2: tick 2 boxes box[blue] and box[red]
Result2: Show all posts that are in BOTH [blue] and [red] category. In other words, it won't show posts that in either category. It'll only show posts that are in BOTH, I repeat BOTH.
More or less this seems like a filter. Leave your contact info so we can further discuss about the project
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Expert in doing this sort of stuff... No upfront needed, all payments through Milestone Payment (Escrow).. Online 16 Hours a day, Can start right away.. Thanks