Using Elementor On Existing Site

Hi, I have a site with a LOT of posts, it got hacked a week ago, which has been fixed, but it has left me with a basic WordPress install with the default theme.

I would like to install Elementor and a theme, so my question is, is there anything I need to think about regarding my posts? Will they all still be OK or are there any pitfalls I need to know about?

Thanks!