An albatross is scored in golf when the player completes a hole in a score 3 strokes under par.
An eagle is scored when you get 2 under par. EX: Par 4 hole you score a 2. Par 4: 1- Hole in One 2- Eagle 3- Birdie 4- Par 5- Bogey
You score a 3 or (1 under par)
An eagle in golf is when you score two under par on the hole. Example: On a par 4 you score a 2 or on a par 5 you score a 3
A "birdie" is not a specific score, it's one under whatever par for the hole is. If it's a par 3 hole, then a birdie is 2; if it's a par 5 hole, a birdie is 4.
Every hole has a par rating - usually 3, 4 or 5. One under means one less than this. So on a par 4 hole a score of 3 is one under par. This is called a birdie.
Technically the "lowest" score on a given hole. 3 under par for a hole.
That would be four strokes. The score would be +1.