How does GDP get measured?

If I buy a banana for 20 cents does that get added?

If the US exports $1000 worth of tires does that get added?

If someone from Mexico buys a tee-shirt from a US retailer online for $10 does that get added? IF they paid $6 to FedEx (American company) does that get added?

If I paid Ford $45 an hour for 2 hours to fix my car does that get added?

Is a Ford Pinto a good first car?

Hi guys i'm a new driver and looking to buy my first car. I saw a car down the block called a Ford Pinto for $1,000 dollars. It looks fun and small