It always surprises me how few people know this. When filling out a Web form, you can use the tab key to skip from one field to the next. Type...tab. Type...tab. Repeat as needed.
This is so much quicker and easier than reaching for the mouse, finding your cursor, clicking the next field, and putting your hands back on the keyboard--for each and every field. Need to skip back a field? Just press Shift-Tab.
And, psst, one more handy form-filling tip: You can usually hit Enter in lieu of clicking the OK or Submit button. Now you can keep your fingers on the keys where they belong!