Set yourself a challenge to learn to identify 10 trees a year. It doesn't matter what time of year you start. But bark, buds, leaf, flower and fruit studied and combinations of, will help you become competent in tree I'd. It's not until you really start to study species types, that you realise just how many species and variants there are growing out there. If I come across something in the field and I'm not 100% sure, I take a twig or a few leaves home in my pocket, to later identify. Often the Latin name can have clues in it, to help you with identification. Be that its characteristics, habitat, habit or uses.