てあげる

「てあげる」is used to describe doing something for someone else with a sense of kindness or helpfulness, indicating that the action will be beneficial to the other person. Here are some points to note:
This structure implies doing a favor for someone, so if the doer of the action (N1) is "I" and the receiver of the favor (N2) is the listener, caution should be exercised. If you want to suggest something to help the listener (who is not very close to you), you can use「ましょうか」instead.
When N1 is "I," N2 should be someone of equal or lower status than "I." Avoid using this structure for someone of higher status or someone not very familiar.
When N2 is "I" (私) or someone in the speaker's group, you can use「くれる」instead of「あげる」.
Depending on the verb V, the particle に after N2 can also be replaced with を、と...
When N is something possessed by N2, instead of N2にNを, you can use N2のNを.