Left: hill 阝(If this radical is at the left of a character, it means "hill", otherwise: "village"), right: finished/complete: 完 (A roof 宀 needs an origin 元 [= groundwork, seating] to be finished and complete.) [Origin: 元 =two 二 legs 儿]
Mnemonic
(An institute needs a lot of space:) The hill is completely used by the: Institute.
This radical shows a hill. This radical 阝 is always on the left of the hanzi. (Please note that this relatively similar radical ⻏ stands for “village” and is in the character always on the right.)
The app has many other functions, such as character selection according to difficulty, practice programs, handwriting recognition and success statistics!