This is a mistake I regularly hear from German speakers, including people with very good English.

Explain something to someone 💬

In German, you can say Ich erkläre dir den Prozess.
But in English, we say:
„I’ll explain the process to you.“
Not: „I’ll explain you the process.“

💡 Quick tip:
Explain something to someone.

You can also simply say, „Let me explain.„