An edible containing 500mg is a highly potent cannabis edible and is far beyond a beginner's portion. It is known that edibles are processed by the body differently from inhaled cannabis. Thus, knowing the amount and serving size indicated on the product's label becomes especially important.
A 500mg edible (https://www.kingbdistribution.com/collections/500mg-thc-gummies) cannabis product will be 500mg in total, not in each piece. Make sure you have read the product's package thoroughly and know how much THC there is in a single serving. A novice consumer should not assume that a big number on the package is a proper serving size.
It takes some time for the effect to kick in and may take several hours. Do not combine your cannabis use with drinking alcohol and any other drugs; never drive under the influence of an edible cannabis product. Keep your products safely locked away from children and pets.
Safe cannabis consumption begins with the right approach to the label reading.