Should i go for learning algorithms & data structures before jumping into learning angular... Please suggest I am a beginner

First learn assembly, then algorithms and NLP, master machine learning. Only then you can start learning angular! Jokes aside, i dont think it's a must, but data structures may help you. I would suggest first learn javascript and its core, it will save you a lot of time when writing apps.

As said above. A knowledge of data structures is important, you'll not realize how important until you have a problem where the simplicity of a framework can't help you, and you need to use a brain :P

It's the same for design patterns, having knowledge about how things are approached will help you. It's not about learning a syntax, it's a way of thinking.