I am no cook really. My DM was hopeless with instructions - "put a bit of flour in" did nothing for me, and she had never heard of scales! But she produced good, basic meals, mostly the same each week. At my posh girls grammar we had one year of "domestic science" which covered cookery, needlework and ironing. The idea was we would be able to ensure that our future staff did proper jobs of it. Despite me being very academic I absorbed every single lesson and can still make fantastic pastry (of all sorts) and embroider well.
In my teens, a boyfriend's parents went on holiday without the two sons and the elder boy's girlfriend volunteered to cook for them. My boyfriend wanted me to do my share so being pretty useless at all but pastry I bought the Good Housekeeping New Basic Cookery book as it was the only one sold in our village shop and I am still using it today. The elder brother's girlfriend got pregnant while the parents were away and the relationship with my boyfriend ended soon afterwards cos I wouldn't "do it"!
I was quite adventurous when newly married (with the cooking, no comment about "the other"!) but DH also produced a few "signature dishes" from an M&S cookbook.
When life got really busy (kids, careers etc) we batch-cooked a lot of casserole-type things and interspersed with fish and chips, sausage and mash and similar. We probably overdid the ready meals for a few years but now I have gone back to the casseroles with more veg than previously. We aren't great on new ideas (never managed an authentic Chinese or Indian, so buy those and add extra water chestnuts, pineapple etc), but DH has lost all interest in cooking from scratch. It takes him ages to peel a potato or a cooking apple (I still remember Miss Ryan and her aim to get us all to peel a spud with a single "string" of peel - and still do it!) or chop an onion, so I usually end up doing that anyway).
My DDs and GC love coming to me cos my food is well-cooked and wholesome, but fairly plain.
I still do a mean Sunday Roast-type meal but have given up making my own Yorkshires.
All that said, I don't really enjoy cooking but find there is no alternative if you want to eat sensibly.