I am starting Leetcode. I need free alternatives to Grokking

After months of putting it away bc ofc the horror of LC is just too real, I am finally going to start LC. From everything I have read it's not about solving 100s of questions but actually knowing the 24 patterns that are explained on Grokking. As I cannot afford Grokking I want to know free alternatives where I can learn the same content. I have tried searching for it so much but I cannot find any resource that breaks things down to granular level. Please help a girl out!