There's only one way to learn - and that is to ask, debate ideas and listen. We all started with zero knowledge when we popped out of our mother.
Wanting to improve your car is natural. We've all done it, some of us still do knowing full what what's going to happen
My 185 han't driven anywhere in 2 years, currently sat in the workshop with a cracked block waiting to have time to build another engine, fit the garrett turbo, and design / fabricate a front mount intercooler & rad system I'm happy with.
I also have a 205 which I've kept standard (apart from LPG) as a workhorse for my long service trips I do. Even with that one modification - better ecconomy at 70p / litre - it's at a cost of me having to re-shim the valve clearances every 15K miles ish as LPG causes rapid valve seat wear. This car works out as cheap to run as a small diesel, in fact cheaper than buying new if depreciation per mile is factored in.