I have an angular app and am now thinking about fine tuning for SEO purposes.

Having had a look at a number of documents and tutorials I am pretty confused! I understand that in the past you would have to use a prerendering service. But then Google updated its bots to crawl JavaScript better. I can't see much about what is the best practice now for improving crawlers and indexing given this?

My current set up is that I have a site map and have transformed my URLs to #! from !. and also, I haven't yet enabled html5 mode.