Newbie question about angular components

[Reza Razavipour]

Never used a dropdown list and never used a calendar control and never used a tree control. Nothing special about these controls... 

I have a dropdown list next to a label text (start) a calendar after that, another label (end) followed by a calendar...

Tree is a list of states and cities and ...

Any good recommendations for a beginner angular programmer?

Any good samples that I can learn from?

[Reza Razavipour]

I failed to mention graph component I also need...