Prediction - Part Category, Subcategory and Type

I often struggle when I have to input for new parts:

* Category (Capacitor, Inductor, Semiconductor, ...)

* Sub-category (Coil, Film, Plastic, Ferrite, ...)

* Type (Pulse,Low Power, Flyback, ...) and other parameters such as # of transistors ...

Even checking the datasheet, sometimes it is difficult to discern between, for example, the multiple subcategories of Capacitors and Resistors, Transformers, etc.

Do you know of any source of information or documentation where I can learn to better tell apart the different technologies?

Thanks