For developer tech stack and roadmap, you can find some useful recommendations at https://roadmap.sh

Personally, I classify Angular into old style front-end framework. At client side, It's better to try more light weigth approach, the UI frameworks like React, Vue and Svelte. I recommend Svelte. In addition, you should take time on server side so that you can get overview of the entire system. WIth more server experience, you will understand backend team better.