Assume by default that people like you. Understand that people thinking and behaving differently is a beautiful display of how life shapes us. When in doubt, assume the best intentions of those around you because you would want the best assumed of yourself.
What you say and think within your own mind and, importantly, how you translate it in the exterior world (virtual too for you people 🙄) will tell you most about your true self.
here are some of the classics to get you started:
:)
:D
:P
¯\_(ツ)_/¯
( ͡° ͜ʖ ͡°)
༼ つ ◕_◕ ༽つ
(ಥ﹏ಥ)
(ง'̀-'́)ง
Have fun out there and be kind to one another.