How do I properly check and add oil to my Briggs & Stratton engine?

To check the oil level, place the engine level, remove the dipstick, wipe it clean with a cloth, replace and tighten it. Check the oil level; if needed, add oil slowly until it reaches FULL line on dipstick (do not overfill). (Page 12)

From the official Briggs And Stratton 500 Series manual, page 12

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