Ask HN: Good resources for systems resiliency / reliability?

My employer has gone through alot of m&a activity, and recently suffered from some significant outages as of late, and we're starting to put an increased focus on improving the reliability of our systems, resiliency to failures and ability to provide support.

It's a big enterprise environment, but I'm in a someone unique business unit that is responsible for a broad variety of critical systems that would typically be in silos. Intuitively, we're pretty good at this stuff where I sit, but we want to level up our capability and lead where we want the rest of the organization to go by example.

Where would you recommend starting? I'm looking for recommendations for best books, resources, types of people to talk to.