It takes a while to get familiar with a lot of this stuff, and then after a while you will find similar things turning up again and again and find you're turning into an expert...
The triangular large piece of metal up top, I believe, is a harrow tooth off of a plow - its a big one if it is that - you will find a lot of them that are triangles maybe 3x3 or 4x4 inches.
Towards the bottom right theres a rectangle with little parallel slots in it - thats a harmonica reed, at least half of one. Those turn up all the time, and hunt long enough and you'll eventually find an intact harmonica. Some of them had silver cases. I've only been that lucky once. On the far left I can't tell if thats a flattened tobacco tin from the old days but some had a shape similar. Thats about all I can eyeball from here. Keep posting your pics - I'm sure I'm not the only one who enjoys looking through and ID'ing other people's finds.
You're digging a lot of iron which means you're basically digging it all which is a great place to begin. When I started out I dug a lot more iron and as a result I made some incredible finds that I would just pass over today. Over time when you really get a good sense of your detector's 'language' and the sound of the tone, not just the VDI number, you'll spend less time digging iron. That said, a nice flat piece of iron is going to sound good on most machines. Good luck to you...