how do i say "to get to know someone" in arabic
for example : lets get to know each other // its good to get to know the community

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Answer

the verb تعرف على "ta3arrafa" (with shadda on the raa) means : he recognized / got to know / discovered after some exploration

lets get to know each other
لنتعرف على بعضنا بشكل أفضل

it's good to get to know the community
من المفيد أن نتعرف على المجتمع

(even though مجتمع is more like "society")

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best wishes for you , I hope you learn it fast 
to get to know = لتتعرف على شخص ما 
Let's know our result test = دعنا نتعرف على نتائج اختبارنا

Answer

لمعرفه أحد