There are 2 amounts listed for THC and CBD content on labels – the first indicates the potency level in the cannabis when purchased, and the second, listed as ‘total THC’ or ‘total CBD’, indicate the potency levels when consumed. It's important to remember that higher THC content indicates a stronger cannabis product, resulting in more intensive psychoactive effects. Higher THC content may be good because it will reduce the amount of cannabis you need to consume, but CBD and other cannabinoids are important parts of cannabis that round out the experience. Too much THC can be uncomfortable for some people. The Ontario Cannabis Store has a great page on how to read a cannabis label

Legal cannabis products can be purchased from authorized retailers with the help of budtenders. Legal cannabis products are required to come in child-proof packaging. Unlike illegal products, legal cannabis producers are required to have a clear description of its contents on the label. These producers are strictly monitored, and their products undergo strict testing for toxic and harmful substances in licensed laboratories to ensure your safety.

Cannabis is an incredibly complex drug, especially compared to alcohol. No matter what kind of alcohol you consume, whether beer, or wine, or whiskey, you're consuming the same drug; ethyl-alcohol. But with cannabis you're dealing with many different cannabinoids, including the two most well researched, THC and CBD. The type of cannabis (e.g. Sativa vs Indica) doesn't actually tell you all that much about the product or the experience you'll have. The old saying of Indica putting you in-da-couch simply doesn't hold up under scientific examination. More important are the cannabinoids and terpenes present in the specific product you consume.