Final answer:
Pressing Tab will move the cursor to the first field of the current record when navigating a main form.
Step-by-step explanation:
When navigating a main form, pressing Tab will move the cursor to the first field of the current record. Pressing the Tab key is a common way to move between fields in forms or documents, allowing users to easily enter data into different fields without using the mouse. This key is especially useful in data entry tasks and navigating through forms efficiently.