Super Saiyan God Goku was introduced when Beerus first showed up on earth looking for the Super Saiyan God.
Many Dragon Ball fans only knew about the three forms that Goku had which are Super Saiyan 1, 2, and 3.
Goku’s Super Saiyan God form was not attained by himself. It was by a ritual that took the strength of 5 pure-hearted Saiyans to achieve.
At first, Goku was not pleased about the form because he didn’t achieve it on his own. Nonetheless, Seeing Goku achieve a new form was exciting, refreshing, and long overdue. So, how did Goku achieve his God form?
Later on, we found out that Vegeta attained the Super Saiyan God Form as well by training with Whis.
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Many fans including myself thought that Super Saiyan God Goku was the pinnacle of strength. However, that was not the case. We also thought that since Goku achieve his new Godly form he would become a God just like Beerus.
However, that was not the case either. Super Saiyan God Goku was no match for Beerus even though they both seem pretty equal in their battle.

Whis stated that in the battle between Super Saiyan God Goku and Beerus on earth, Beerus was only using 70% of his powers.
So what I want to do here on the posting is to explain a little bit about Super Saiyan God Goku in the anime. This is for new fans that do not understand the difference between Gold, Gold, and Blue.
Goku Super Saiyan God Form Exlpaind
In the battle between Goku and Frieza in Ressurection, F. Goku stated that he is a Super Saiyan with the Powers of a Super Saiyan God who is a Super Saiyan.
So what this means is that when a Saiyan with the power of a Super Saiyan God ki transforms into a Super Saiyan.
So, going back to the battle between Goku vs Beerus. In the Battle of Gods, there was a part in the fight where Goku loses his Super Saiyan God form.
Beerus threatens to destroy the earth and Goku loses his God form while fighting Beerus.
Goku had reverted back to his golden-haired version which knows as Super Saiyan. His golden hair from Super Saiyan was what Goku felt comfortable fighting with.
Nonetheless, Goku’s body is revered back to what his familiar with while still attaining the Strenght, Speed, and Power as the red God form.
Even Beerus himself noticed that Goku retains some of the God Powers he had at the beginning of the battle.
This would be referred to as God Ki, So Goku had retained his God ki from the ritual he did at the beginning.
Goku Super Saiyan Blue God
Goku Super Saiyan Blue God has been confirmed in the anime and manga that it is way stronger than Super Saiyan God Super Saiyan (red).
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We saw Goku in the anime while fighting at the tournament of power using Super Saiyan Blue then revered back to God. A lot of people did not know the reason why Goku revered back to God.
So, the reason Why Goku reverted back to his God form in the tournament of power was that the God form used up less stamina.

Goku Super Saiyan Goku from (red) was not meant to be a stronger power-up of the blue. He only wanted to preserve his stamina.
Super Saiyan God Super Saiyan Goku
Goku love to use his Super Saiyan Gold form more than his Super Saiyan 2 and 3 form.
Why is that?
Well, using Super Saiyan 2 and 3 are absolute transformations while using Gold and blue preserved energy, especially God.
Once again, in the tournament of power, we saw Goku switch between God and Blue against Dyspo while protecting Hit. It was just the same as in the manga when Goku and Vegeta both switch between the two forms.
Super Saiyan God Vs Super Saiyan Blue
Both the Super Saiyan God and Super Saiyan Blue form require Godly ki but they are very different in nature. So the thing is even though Super Saiyan Blue gives off tremendous power and ki control. Plus Goku can stack Kaioken on top of Super Saiyan Blue.
Super Saiyan Blue tends to wear out the character’s body over a period of time. Also, even though Super Saiyan God flare out of Goku, he started to believe the reason he loses God form when he fought Beerus was because his body was not used to the God form.
However now deeper into the anime, Goku has more control over his body and as a result of that, he can tap into the red-haired God form at will.
Goku vs Dyso, Tournament of Power
Super Saiyan God Goku explains to Dyspo that he has a greater knowledge of how his power and transformation work in battle. Goku then goes on to explain to Dyspo how each transformation affects his body. Transformations such as Gold, God, and Blue to preserve stamina.
This is why Goku to Vegeta and other foes he fought, consider him to be a fighting genius because he’s able to gain awareness of his body. That is one of the reasons why he’s one of the first Saiyan to achieve the Super Saiyan form or the Gold form.
To give an example of what is being said here, just look back at Dragon Ball Z when Trunks and Vegeta when into the time chamber.
Both Vegeta and Trunks knew about the ascended form, however, only Goku and Gohan figured out how to ascend to grade 4.
So, it is the same thing that applies to Goku when he was fighting Dyspo. This was back in the tournament of Power. Goku is good when it comes to figuring out how to ascend.
Which of Goku’s forms do you think is the best to fight in? Let me know your answer in the comment section.