After a few days, you'll notice a foam forming on top of your starter and your airlock should be bubbling away. This means your yeast are happy and active!
Give your starter a few days before using it so the yeast can grow and reproduce.
Then when it comes time to pitch the yeast into your wort, transfer it either by siphon or by pouring it into the wort - just try not to splash the yeast around too much. You also want to make sure that your wort is about the same temperature as the starter is so the yeast aren't shocked by the change.
When your starter is active, you'll notice a layer of yeast sediment at the bottom of the container. You can either scrape this sediment off and pitch this as well or just use the liquid in the container. The sediment will have a lot of yeast trapped in it so if you want a high alcohol content beer, it's advisable to scrape the sediment into your fermenter so that no yeast is left behind. But for a lighter beer, just leave the sediment behind.
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