Before printing out your database or otherwise sharing it with the greater public, you want to make sure your spelling is correct. Nothing screams "amateur" louder than a City field that reads "Chciago." All the spell checking commands are found under the Edit→Spelling menu.
Sometimes you want to fly through data entry, and then do your spell checking later. If this is your preference, you have three choices:
Choose Edit→Spelling→Check Selection to spell check selected text only. This method comes in handy when you're pretty sure a short passage, or even a single word, is wrong. Highlight the text you want to check, and then choose the menu command.
To check an entire record, choose Edit→Spelling→Check Record.
Finally, you might want to check spelling on many records at once. In this case, choose Edit→Spelling→...