If you want big arms fast you need to start with a full-body workout. Your biceps, triceps and overall arm size will increase naturally as you get your core built. Once you have a solid foundation you can start to focus more on certain body parts.
When you first start, do your core training first at the end of the exercise you are doing isolation exercises you on certain body parts. Have a solid core is a secret to getting big fast. If you want to know how to get skinny arms quick then you can explore https://www.waytoskinny.com/how-to-get-skinny-arms/.
Do not just look at how much weight you can lift or how many reps you can do. For the fastest results, you need to focus on doing exercises under control with the right techniques and mental focus on the muscles you're working on.
If you just look at how much weight you can get in the bar, most likely you will have a sloppy technique and would be cheating to use other muscles to perform the exercises. This can cause injury and also slow down your progress since the muscle group you're working is not working properly.
So remember to get big arms you quickly get the gist first built. Once you have a solid foundation and increase the strength in the back, chest, shoulders, and arms you will see results faster when you start to focus on a specific muscle group because it would be easier to have the right technique and less fraud.