# Advance ink!

**Storage**

https://use.ink/datastructures/overview

- [ ] Explaination
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- [ ] Code Walkthrough
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- [ ] Demo
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**Chain Extension**

https://use.ink/macros-attributes/chain-extension

- [ ] Explaination
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- [ ] Code Walkthrough
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- [ ] Demo
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**Custom Environment**

https://use.ink/basics/chain-environment-types/

- [ ] Explaination
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- [ ] Code Walkthrough
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- [ ] Demo
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**Cross Contract**

- [ ] Explaination
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- [ ] Code Walkthrough
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- [ ] Demo
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