One of the huge things you will be using constructs for is passive defensive constructs, it is really important to have these for when you are not able to actively defend from attack or things such a this.
So, exactly how do defensive constructs work? Well, they work through creating a construct to deal with a scenario, such as, if a attack was coming at you, you would instead of just "letting it" hit you, have a defensive construct up to block or, reflect it, absorb it, nullify it, or many oter things to avoid any damage from the attack.
Though, they are not fool proof as they can be broken, exploited, avoided, etc.
But moving on, I will give you some basic information on a few defensive constructs and how you will make them.
Bubble Shield
This is one of the most basic defensive constructs that you will use in energy work, this construct is created through you simply molding a hollow sphere with you as the center around you, a few feet, etc. This in of itself won't do much but as I said, it is basic.
It can be improved upon by adding other functions to it, such as absorbing the attacks, deflecting them, etc.
Orbiter
This is another construct that is relatively basic, it works well with the bubble shield as well!
For this you will want to create a sphere of energy (or however many you want), now then, you will program it to orbit in a pattern around you, and whenever a attack comes near you, have it "go" in front of the attack and act like a cushion between you and the attack, or reflect it, etc.
But beyond this, defensive constructs can get far more advanced, and I urge you to work on them a lot in your spare time, etc.

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Now then, as we covered offensive constructs, it is time to cover some basic offensive constructs. Offensive constructs are constructs that are made with the aim to damage and or "impair" another or a construct.
There are many ways to do this, exploiting it, (Later unit), breaking a hole, removing a part, corrupting it, etc. But we will start off with some of the most basic methods first.
The first construct I will cover is the simple penetration construct, this construct is designed to penetrate the energy system of anther through drilling a hole into it. (Though it can work with constructs as well)
Okay, start off...
Form a construct and then will it to sharpen on one side, preferably have it in a way that it is similar to a knife, this isn't fully needed, but this is a basic method. Now then, use that construct t attack others, etc. If done right it should work somewhat.
Now the next method is similar to the above, but instead you will be making a hole through another method. Form a construct and then make it so it will instead "extend" energy vein like structures into the system, it will be hard for the construct to do, but once it does that, make the construct next afterwards, connect the "veins" together and then pull out that section of the system.
Okay, moving on to another method... A draining construct... This is rather self explanatory, you will hook up a construct to the system o another and then begin to make it have a sucking effect on the energy.
You may be confused why I am not going more in-depth on these as well, the same in the defensive construct, the reason is to hopefully get the readers to think on there own, develop the constructs themselves, etc.