Symbols icons guide anywhere?

Hiya new to this, any help appreciated-is there any guidance available anywhere re: mechanics of site eg symbol/icon key, idiot proof dummy runs (specially for CFD bit), where you could go through example short selling etc etc using every button? Have watched YouTube vids and v good for theory but am making spectacular gains and losses on practice account but not 100% sure how I’m doing it, so am wary of rolling dice with real £, which I want to attempt. Thanks in advance