This section is on the basics of positioning things. In React Native, everything is relative by default. This means that if I nest View into another View that has marginTop: 40, this positioning will affect my nested View too.
In React Native, we can also change positioning to absolute. Then the position will be calculated by a fixed number of pixels from our parent. Use the top/bottom + left/right keys in StyleSheet. Remember, other Views will not take this position into account. This is handy if you want to make Views overlap:
Three boxes overlap other because they are absolute-positioned to do so
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