Is it possible to index a web application on Angular 2 by search bots?

Question

Search Engine Optimization

Hello.
I now have a problem - when developing a site on the first angular, I completely forgot (or did not know) that such an application would not be indexed by search robots. I read/reviewed a bunch of SEO tutorials for js sites, and realized that such sites should render the page and send it to the search engine bot, and the user gets a normal dynamic page as before.
My question to the connoisseurs is what would be better, in which direction to look:
// put prerender on the first angular and work with it
// finally start learning angular2 (it seems to be more SEO friendly, as it renders the page by default, correct if misunderstood)
// use php frameworks?
Now the site is based on the first Angular, and as if it's just a project for the sake of a hobby / in my free time from my main job /, and to pull up JS. Thanks for the advice