Communication skills happen to be one of the most important skills required in business. Because with this skills, I can explain my ideas, opinions, and also get feedbacks.

Answer 1

The word "skills" (as you've used it) is plural here. Therefore, you need to change the following words to plurals:

one

this

Answer 2

Communication happens to be one of the most important skills required in business. Because with this skill, I can explain my ideas, opinions, and get feedback.