Know your co-workers.
It’s obviously important to be friendly with your boss and impress them, but it’s also just as important if not more to know the people who are on the same level as you. They are going to be looking for those same open positions as you. This might put up a red flag for competition, but they can really help. Your boss can only tell you about what is happening with that company and give you a reference. This is all very helpful, but your co-workers will hear about jobs from other companies and if they can’t take it, they could pass it along to you!