Eat (by left clicking while the item is in the selected item box) some bacon (from a pig), cooked bacon (bacon in a furnace), fish (you need a fishing rod), cooked fish (fish in a furnace), cake or cookie.
You can also switch the difficulty to "peacefull" if you wish
Chat with our AI personalities
you need a mod to do that.
The ender dragon has 100 hearts of health.
Search up Minecraft Wiki
Yes
20 health points, just like normal villagers.