The "u" in non-american english

[Kantor]

darkhaven63 said:

It's not just the "u". It's also the "E" as well. Like we would spell judgment and the British spelling is Judgement

I am a bit confused with the British grammar rules for irregular verbs as well like "To knit"

American:Knit

British: Knitted 

But I sometimes use British spelling when I'm writing or sometimes typing
Other times I use it inadvertently.

I don't understand.

I knit

You knit

He knits

We knit

You knit

They knit

Isn't that the same in English and American?

And then in the past tense, I knitted, you knitted, he knitted, etc.