The most important skill for a Linebacker is learning how to defeat blocks. A Linebacker should expect to defeat a block before he makes the tackle.
It's also one of the hardest skills to get your Linebackers to execute. The natural tendency is to run around those big guys trying to push you.
I've studied a lot on coaching linebackers. The best resource I've found is Lou Tepper's Complete Linebacking book: http://amzn.to/2mXKjMp
If you haven't read it yet, you need to get it. Every football coach should check it out.
In this episode, I talk about 3 styles of block destruction. We focus on the core principles including the strong inside foot, leverage and exploding the hips through the blocker. Then you'll shed the block and go make a tackle!