This is the 1126th most frequent Japanese word.
を通して
"Through; by means of; via."
The word 'を通して' in this sentence indicates the means or intermediary through which the action was achieved, that is, a friend.
私は友達を通して新しい仕事を見つけました。
I found a new job through a friend.
Here, 'を通して' is used to express the medium or channel through which information is obtained, namely, the Internet.
インターネットを通して多くの情報を収集できます。
You can gather a lot of information through the Internet.
In this example, 'を通して' demonstrates the process or method by which a goal is achieved, specifically, through education.