How to properly play as an engineer in Team Fortress 2

Engineers are definitely one of the best classes in Team Fortress 2 whether its defending a control point, teleporting a friendly teammate, healing teammates, or defending the intelligence. Engineers can be used almost anywhere even if the engineer is on the attacking team; the engineer could built a teleport to get his teammates to attack the opposing team faster.

One of the most common mistakes that I see engineers doing is exposing themselves. Spies can easily backstab and sap the engineer's buildings and get away with it. Another common mistake I see engineers doing is placing their buildings in an unprotected environment where stickybombs and rockets could easily get to their helpless buildings.

 How to properly place your buildings

• Look for big walls in corners
• Surround yourself with your buildings so that you are corned in and can only get out by jumping
• Keep your buildings close
• When a spy saps your buildings, fix your buildings then kill the spy
• If a spy is continuously sapping your buildings then kill the spy and fix your buildings 
• If there are no corners then build a triangle using your buildings so it would like this:

Sentry

                                                                          Teleporter    You    Wall

Dispenser 

 Things not to do

• Don't place your buildings a mile apart. Always keep your buildings close so you can repair them or remove a sap 
• Never leave your buildings alone

Remember, you have to cover your back so get into a corner or place your buildings so that a spy can't backstab you. Other than that, don't place your buildings out in the wide open as spies can easily destroy them with their revolver since the revolver does maximum damage on buildings no matter how far away.