Trouble with Q vs R endgames

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wyoav211933
I have practiced some beginner endgames like Q+K vs K, R+K vs K, K and pawn endgames, Q or R vs solo minor piece, and feel pretty good about those, but Q vs R endgames are really tough for me, much harder than the others. I know for example that you want to keep the rook far from the king so you can fork with the queen or maybe if the king is by a side you maybe able to checkmate without capturing the rook, but I feel like have I hard time forcing them to separate or stay separated. Any advice, articles, or videos to help with this?
blueemu

When it comes to separating the Rook from the King, the winning technique is to force a zugzwang... a position where the opponent is forced to move and thereby to ruin his defensive arrangement.

Consider this position with Black to move:

 

Black gets mated or loses his Rook in all variations.

But what if it's White to move? Then you win by zugzwang:

 

,,, reducing the position to an already-solved problem.