How to build good credit Fast?

You can't build credit fast. You build credit by having a history of on time payments. If you have the money to pay it back right away. Why not just buy it? What does 3 transactions have to do with it? Don't buy it if you can't afford it.

Bar far thew biggest thing is to avoid any negatives, like paying late, which also have cause your interest rates to be raised. Paying off the balance each month is good for avoiding interest charges, but I have not heard that your monthly transactions are a big factor, it is good to keep any running balance well below the maximum, 66% is OK 33% to 50% is better.

You cannot build good credit fast. If you try to build credit fast, then you won't build good credit. To build good credit, you must either (a) not be trying to build credit, or (b) be trying to build it slowly. Good credit can only be built slowly. Credit that is built fast will be bad credit.

No such thing as building credit fast, it takes YEARS of good payment history and if you max out your card, that also hurts you

You can't do it "fast." It'll take a couple of years of on-time payment history first.

Don't pay cash.