How do I put this, experience is gold. Nothing speaks more than experience itself.
Live - learn - don't get lazy. That's where the biggest issues happen.
When many people start their saltwater tanks. Algae blooms strike.... They get lazy cleaning things up. Algae covers corals and starts killing them. Oxygen gets depleted. Food source and oxygen is taken by algae.
If you can handle yourself and keep things under control... Even a hammer coral or frogspawn would be safe.
Most coral deaths are because of bad husbandry. Second, shipping stress. 3rd injured coral to begin with (disease prone).
Senstive life forms do not like parameter swings. As the aquarium ages and the more you do what's needed to keep things stable, keeping up with water changes, taking care of algae blooms. This all falls on the person.