Auston

Okay

So

Grade 1 = Super Saiyan 1 (Ssj1)

It is actually debatable whether or not Goku was slightly Beyond true Super Saiyan 1 in his first transformation.

Grade 2= Muscle form (Super Vegeta)

Super Vegeta is Vegeta in bodybuilding shape from training so hard. (Super Vegeta Super Saiyan)is more like Semi Ultra Saiyan or SSj1.25

Grade 3 = Ultra Saiyan (ssj 1.5)

This is displayed as max power mode it's also used by freezia, even cell used it at one point. Goku displays it in the time chamber. Originally Kia Ken even had a similar effect due to Goku not understanding how to use the power yet.

Grade 4= Acended Saiyan

Goku gives a pretty good explanation for this during the Cell, and Majin Buu sagas.

Well this is technically Super Saiyan 1, and it is a perfected version. It's actually a step below the form used as Super Saiyan prior to its existence. As in the one used by Future Trunks Goku versus Frieza and Goku versus Trunks. And Vegeta versus 18 also future Gohan.

I could keep going for everything but I do want to note this.

Super Saiyan 2 SSj2

Was originally meant to be the end of the series. And was actually called Saiyan's rage form and was referenced as, ascended Super Saiyan or Super Saiyan Beyond. It is also highly likely this form was going to be "hybrid/ Gohan" specific, with the original reasoning being his Half Human Side allowed him to reach higher emotional Heights which Saiyans normally struggle to reach. By the end of the Majin Buu saga they had pretty much dropped that and brought in the hole hidden potential gig. I'll stop there but I believe I could do a fantastic article about this.