if you're new to unix-like operating systems, this will be useful for you. check it out on my youtube:
terminal-tip-001

tl;dw

in your shell configuration (~/.zshrc or ~/.bashrc) introduce a new cdnew function (or call it whatever you like).

cdnew () {
  mkdir -p -- "$1" && cd "$1"
}

now source your config file, or open a new terminal window. now you can run cdnew <some_path> and happily make a new dir + cd into it with a single command!