Watched a guy at the lumber yard flip a board to check the grain and I just stood there feeling like a fool
I was at the yard in Tacoma picking up 12 oak boards for a shelf job when this older guy next to me grabbed a piece, looked at the end grain, and set it back down. He caught me staring and said 'you checkin the ends or just the faces?' I had no idea what he meant so he showed me how the rings curve tells you which way the board will cup once it dries out. I had been grabbing boards by looks alone for 6 years and just eating the warping later. How do you all check grain before you buy?
Man, this is the whole thing with getting good at anything, nobody tells you the one little trick that changes everything until you stumble into it. Same deal with sharpening a knife, I hacked at stones for years before some guy showed me the burr and suddenly my edges lasted. We just accept the bad results as normal until someone lets us in.