Answer 1

Gabriel well you have some indentation problem
All elif have to be of same indentation as if block
Here's Your right code:

x = int(input())
y = float(input())

BMI = x / (y**2)

if BMI < 18.5:
print("Underweight")
elif BMI >= 18.5 and BMI < 25:
print("Normal")
elif BMI >= 25 and BMI < 30:
print("Overweight")
else:
print("Obesity")

Answer 2

Your code?

Answer 3

Learn indentation from the Python course and here:

https://www.geeksforgeeks.org/indentation-in-python/amp/

https://www.w3schools.com/python/gloss_python_indentation.asp

Answer 4

Next time try to show your code before asking for help

Answer 5

Gabriel 😊
My pleasure ✨