Be consistent in your spacing and make your margins wide and calm.
If you choose to insert one space between your professional experience and your skills section, use a single space to separate all the other sections of your resume as well. You can also use two or three spaces, but no matter what your choice is, just stay consistent. It's also a good idea to create your margins wide and relaxed. Sometimes, a good management of white space on your resume can send a message that's stronger than words.