Something wrong on simple code

This is someting srong on this code… can you fix it?

print("Ready to start?")
write("=> ")
ready = io.read()
if ready == "Yes" or "yes" then
print("Your choice is yes")
elseif ready == "No" or "no" then
print("Your choice is no")
else
print("Wrong choice")
end

This will always return true, because you check if ready equals "Yes" and if "yes" exists (which it always does)

if ready == "Yes" or "yes" then

Use this instead:

print("Ready to start?")
write("=> ")
ready = io.read():lower()
if ready == "yes" then
print("Your choice is yes")
elseif ready == "no" then
print("Your choice is no")
else
print("Wrong choice")
end

io.read():lower() will convert the input to all lower case characters.

You code will work fine but with the or's you need to do this:

if ready == "Yes" or ready == "yes" then

Of course, but in this case string.lower() is good practice as it also accepts 'YES' and the sorts.