# Primer

- [Bitmap & Masks](/aave-book/primer/bitmap-and-masks.md)
- [padding and bytes](/aave-book/primer/bitmap-and-masks/padding-and-bytes.md)
- [WadRayLibrary](/aave-book/primer/wadraylibrary.md)
- [Math Operations](/aave-book/primer/wadraylibrary/math-operations.md)
- [WIP: Scaling different decimal representations](/aave-book/primer/wadraylibrary/wip-scaling-different-decimal-representations.md)
- [WIP: 2's complement](/aave-book/primer/wadraylibrary/wip-2s-complement.md)
- [casting: to uint128](/aave-book/primer/wadraylibrary/casting-to-uint128.md)
- [PercentageMath](/aave-book/primer/percentagemath.md)
- [Embedded vs Linked Libraries](/aave-book/primer/embedded-vs-linked-libraries.md)