My sister said to skip the couch cushions and go straight to the dining chairs, and she was right
She stopped by my apartment in Boise last month and watched me fight with a saggy cushion fort for 20 minutes before she grabbed two dining chairs and showed me a better way. The tall backs give you way more height, and the seat rails hold a sheet tight without clips. I've built three forts since then and the chair frame has not fallen down once. What chair or furniture trick did someone show you that you still use?