Canons of construction were one of the centrepieces to the way courts interpreted contracts.
Now it’s different.
Of late, many of them have been downgraded in importance. But there are some that you just can’t live without, if you’ve got anything to do with reading and interpreting contracts.
Get to know them, and your understanding of the legal effect of your own contracts should move to the next level. Know what you are looking for. Read it more like a lawyer would.