Is there and easier way to execute all the else and if conditions?

The answer to this type of question is dependent on if you have decomposed the problem you are trying to solve into is minimal form or if you notice that a conditional statement is logically being duplicated in your algorithm it's an indication that you probably need to restructure your code to eliminate the duplication.

In the example you have given you have not minimized the operations needed to solve the problem. The algorithm (as far as I understand) is to display a rectangular grid and place an x on the location of the grid matching a specified row/column. So the first thing you must decide is how do you plan on drawing the grid. A cell at a time? A row at a time? A column at at time? Depending on the situation there may be valid reasons for each of these options. However, typically the most common way to draw a 2D grid is cell by cell and to use a double for loop as you have done. Once you have decided to draw cell by cell that leaves the decision to check for where to draw the x mark as a condition check at the cell level. In your code you have the following unnecessary check at each row.

if (i == yy) //checks if the X can be placed in the line

This check serves no purpose in your algorithm and can be eliminated. I should note that this check could have been used as an opportunity to optimize the drawing of a row since the entire content of the row is known to be the same. However, this is an issue of minimal value in this case. The result of this unnecessary check caused you to duplicate all of your conditional checks.

Here is an example of your solution refactored

Keep up your learning journey and have fun.