Commonly Used Fishing Knots
NON-SLIP LOOP KNOT
This knot allows the lure more motion especially when you're using a heavier weight line. As with the "modified clinch knot" you'll want to lubricate the knot with water before cinching it tight. This one takes a little practice to ensure the loop is a reasonable size.
MODIFIED CLINCH KNOT
This is probably the most common knot among new anglers due to its simplicity and strength (if tied correctly). A couple good tips is to make sure you have at least 5 twists and to lubricate the knot with water before cinching it down. This will help prevent the knot from slipping loose. Check the strength of the knot by pulling on the lure and the line to see if the knot starts to come loose. If so, tie again but increase the twists.
Another popular knot among anglers is the "Polomar Knot". This is a very reliable knot that never slips.