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.