Best statistical treatment to finding relationships between two variables... and how to do it.

What statistical approach is best for finding the relationship between the 3 types of social media networks: FB, IG and Twitter to the netiquette of students?
Is it Pearson R, chi-square, t-test or others?
Need help because I do not know how to do this.
Below is the data gathered. I need help interpreting this.
Thank you very much in advance.