You can find out a lot about how Konqueror works without needing to read this entire document if you take advantage of Tooltips and the What's This? feature.

When you hover the mouse pointer over a Toolbar tab button it should bring up a terse description of what that button does.

What's This? is invoked by the Menubar Help → What's This? item or by Shift+F1. It changes the cursor to show a question mark alongside the arrow.

When this question mark is visible, a left mouse button click won't actually do anything until you have clicked on a control (or the text alongside it) that supports What's This?, in which case it will display a reasonably comprehensive description of what the control does. Most of the dialog boxes that Konqueror brings up support the What's This? feature.