Enter
The kanji and the radical are the same, so remembering the meaning of this kanji is as simple as making sure you know the radical for enter first! If you know the radical, you know this kanji means enter as well.
にゅう
はい, い
None
Turns out, after you enter the tent (remember how the person in the radical is entering one?), you're given a new (にゅう) one! Why? No idea, but hey — it's new!