Angular 2 and SEO meta tags

Question

i need to add met tags to my angular website 

• To put all keywords into Index.html page?
• To put separate tags for each component via .ts code

these are the two options i have in mind which one should i chosse 

Answer 1

Using Angular services to handle this at the component level would be the best option to do.
import { Meta, Title } from '@angular/platform-browser';
Keep in mind that adding meta tags in index.html would make the description title and everything the same for all pages in the app which would bring a big disadvantage to your SEO.