If not understanding code, read the documentation or debug the code. When trying to modify...
1. Follow proper indentation.
2. Don't make spelling mistakes and follow naming convention.
3. Don't try to write all the code in one line (based on line length set)
4. Simplify if else statements if possible.
5. If value of method call need to be used once, don't store it in a variable. Directly use where ever it is needed.
6. If there is duplicated code, put it in separate method and re-use it if possible.

So, just to recap if you missed the last few episodes. I've been a web developer for years. But I decided to get a degree and go to uni.

Also I am firmly on the fewer comments side of the debate about self-documenting code. Even though I usually rephrase it and say method and variable names are comments. Basic idea: something is unclear, you should leave a comment. But, before you leave a comment, take a good look at your method. Can you rename a variable? Maybe the method name? Maybe extract a method into smaller methods so it doesn't need a comment? And only if you fail to do so, leave a comment.

Alright, now that we rehashed that, uni coding makes no bloody sense.

There is code that is abbreviated to the max (or min).

And then, they need everything commented. I mean, why do that? Why call the parameters a and b instead of base and exponent. And then say:
"But write a whole article about it above the method". Like:

a is the base for a power operation.
b is the exponent for a power operation.
return int representing a to the power of b

How about just do this:

public static int power(int base, int exponent).

How is this not the same documentation?

Is it because we're at a uni, a place for smart people and smart people shouldn't have an issue keeping a mental map between the variables and their meaning?

Or is it because they are all mathematicians. All respect to applied mathematics. I mean, the function about exponent calculation, I was not aware that it could be that effective. But on the other hand, keep mathematicians away from programming. I get it, writing maths per hand doesn't have intellisense and therefore you don't want to write long variable names. It's and old tradition. Yada yada, yah.

But programming is not maths. And maths shouldn't be maths like that. Right naming makes it simpler. It might still be a while until we all LaTeX rather than handwrite and be able to give maths right naming schemes, but programming is beyond the point. Calling the array you handing in a function A and the one that you're returning D makes no fucking sense.