Beginner's Chess Traps/Blunders: QGD/Slav: Ne4

In this series, I'll be going over typical beginner's mistakes that I encounter. Today, we are talking about Ne4 in the Queen's Gambit Declined/Slav Defense. The soonest example is

There are probably many other positions where this can arise, but by far the most devastating would happen if black plays h6.

Of course, there are many more scenarios where black can go wrong, but still, look for when you can use this and when you can not.