Creating a large project involves creating a menubar, toolbar, form which acts as the first form appearing on the screen with buttons on it to open other forms and so on.
Once a new form appears on screen you can add certain controls so that the form is useful. Each of those controls may have properties, which can be set through the property window on the right or in code. Each form contains a special code section the form module, which contains the form related functionality, e.g. code to react on events. Once a form is on screen, you can switch between the design mode (F10) and code mode (F11).
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When you change a property name, releated procedure names are not changed and have to be manually renamed yet.