... that the interface is very intuitive ... when you want to do something, try it .... it normally works. Somethings that are not so obvious is "using" specific items. Sometimes you will click the "use" icon, click the item to use, then optionally a target. Other items require you to take the item from inventory, exit the review screen (so your mouse cursor turns into the item), then click on the target.
Other than that, whenever you want to know more, right click on something (and check your journal after significant events ... sometimes more info is written there than what transpired).
Tools for Wizardry(r) 7