Sleep training

We are looking to casually sleep train. Basically we have an amazing sleeper I just want to make sure to continue to nurture that side of her as she ages so she stays that way. I say casual because everything I see online (that I don’t have to pay for) is very structured and seems to be designed for babies that need a lot of extra support. But maybe I’m not looking in the right places? If anyone has anything that has worked for them in the past or resources to share please do! Thinking long term for sleep success. thank you 🙏