You might remember the meaning of the character 来 with this easy mnemonic:
An (一) art student was rushing to finish his work titled Tree (木) when he ran out of brown pencil. He asked his girlfriend who came to visit for her eyebrow (丷) pencil as a quick substitute but she said she didn't have one on her.
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.