C++ Interview Preperation [closed]

I am appearing for interviews for Senior Software Developer. Leetcode has been very helpful in developing my problem solving skills. I do feel though I am lacking production level C++ development skills. For example, implement a smart pointer C++ class, implement some functionality using mutex and multi-threading. I am familiar with the terms by reading up these concepts from online tutorials, however I do lack hands on coding experience with these theoretical concepts. Does anyone have any suggestions on from where I can practice for these topics/areas. Any tutorial or projects on Github which I can clone and start working on?

Thanks in advance!