Making either cannabis oil or cannabutter employs essentially the same process. I always have both in my house.
When planning to make canna oil for homemade weed edibles, you need to determine which oil you want to use. The oils I use most often are olive and coconut
THC is released into the oil during the heating process, and the oils with a higher fat content absorb the most THC from the plant. Olive and coconut have higher fat content than canola. However, they really should not be heated to a super high temperature. (Once the THC is in any oil, you need to keep the heat relatively low, no boiling allowed.)
The proportions for the cannabis oil that work best for me are to use one ounce of good weed shake or flower, and 2 cups of oil. Follow the process used to make cannabutter, using water and being sure that there is at least a two-inch layer of water under the weed/oil mixture throughout the cooking process. (heat on low heat, water and oil can splatter if cooked on high heat)
After spending the night in the fridge, I sometimes have to spoon the canna-oil off the top, as it does not form a solid disk.
2 cups oil
1 ounce potent marijuana
NOTE: Boiling is said to decrease the THC potency.