Hi Andre, I've been focusing on Js for like a 18 months after coming from PHP and Rails. Ive mainly been working with frontend frameworks and tooling but I feel like a jack of all trades, what are the best areas to focus on if I want to become better at FP and asynchronous/ reactive programming, do I need to switch my focus to the back end(node), also do you think it's better to focus on either server or client side over full stack?