Okay, so having learned and remembered the pronunciation "ni3", let's look at the components: 你 = 亻 + 尔.
So, let's learn 亻! This is a very common character component appearing in over 150 Chinese characters and refers to a person. Assigning a mnemonic symbol to this component has extremely high leverage: it makes learning literally hundreds of other Chinese characters easier!
When choosing mnemonic symbols, it's very important to be as specific as possible. "Person" could be anyone, you have to choose one specific person and stick with it. I choose "Rosa Luxemburg" because she's a famous historical person whose name starts with "r", as in "ren2". Remember that you can always add your own mnemonics with your own mnemonic symbols; but this comes at a cost, because then you'd have to rewrite all mnemonics that this symbol is used in. Choose wisely!
Next, let's have a look at the pronunciation "ren2", by first looking at "r". Click on "Next Lesson" when you're ready to go on.