[TUTORIAL] How to make a custom (aggressive) entity walk AND swim !!! (like drowned)

So I have found a way (enven though it might be kinda buggy) to make an entity walk AND swim ! 

I have seen that many peole a trying to figure that out sooo...

Simply choose an entity base in the "AI and goals" part : https://imgur.com/a/9xSXejt

Go to the code in "(YourMob)Entity"vand replace the base you chose with "Drowned" in my case, "Zombie" :

Before : https://imgur.com/a/Q78EBU4

After : https://imgur.com/a/SSHELCG

You may need to adjust the step height as it seems that my entity has trouble to get out of the water (?)

This process may be wrong as i am not an expert in code or with the advanced mcreator features but it seems to work for me, I keep this updated for any fixes/errors...