Hello, I am checking out a bike with aluminum frame to buy , is it fairly straight forward checking for cracks in the frame, I know to check the welds.

here is what I got to look for

Are the chain rings and sprocket teeth sharp or still rounded? Sharp teeth on cassette and chain rings are a sign that they are worn out.
Are the wheels still straight?
Do the gears change quickly or are they sluggish?
Do the gears slip when you put a lot of pressure on the pedals? Test the most commonly used gears (usually the middle sprockets of the cassette) to assess this.
Look for cracks in the frame around the bottom bracket and head tube area. They are the parts of the bike with the highest stress levels. Cracks can be very small so check carefully. If the bike even has the smallest crack, steer well clear of it!

does this sound right?