Welcome to the forum, justnothing.
First, please study the following corrections I have made to your post:
Hello guys,(salutations are unnecessary).
I'm so excited be a part of this club.
by the way,I have a problem in using the word "inline". Is it correct if I write "inline" in the sentence "This cooperation is in line with the country's specific needs."?
Please (no comma) give me a correct explanation. Thank you.
Only 'in line' is correct. It means 'in accordance with'.