Great question — answering as the UphillTech team:
As a assistant referee you are on one of the offside line near any of the teams sideline one of the other assistant ref would be on the other sideline There is something called a defence line also know as off side line this line is some times kept very high (closer to the halfline) the assistant ref should stay on the same line as the defense line and move according to the defenders moving up and down When ball goes out for throw its the job of main ref to give the throw to the respective team the only exception is if the ball is very close to where the assistant ref is standing and if the main ref is far ,then its the job of assistant ref to raise the flag and give signal how to keep an...
Full answer by joel.t: https://sports.stackexchange.com/a/25511 (CC BY-SA 4.0).
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