If something is right up your alley, it would mean that the situation should be perfect for you or ideal for your skills and interests. For example: if you like math and physics, an engineer major should be right up your alley.

It means something you'd like. For example if you enjoy football tshirts & someone said "I saw a shirt today with a football on it, it would be right up your alley." It suits your interests. English is strange.

"It's up your alley" is a common English idiom basically meaning "it suits your interests and/or abilities."

Do a better job than your friend