Stack blocks have a dent at the top, which allows you to connect them to other blocks, and they also have a bump at the bottom, which you can connect other blocks to. Stack blocks are the main blocks which get the job done and are found almost everywhere.
![notion image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2Ff96ab323-a63e-4970-810d-65c7b2c67b2a%2FScreen_Shot_2021-04-17_at_4.59.43_PM.png?table=block&id=726d5e22-fe7b-4876-acf1-b0e1a3502a11&cache=v2)
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