What do I need to do to find a job in Germany? What are the most reliable job sites?

I live in another country. I'm not in Germany.
I have intermediate knowledge of English. My German is at beginner level. I want to find a job and work in Germany. Which are the safest sites for this? What should be done?

What do I need to do to find a job in Germany? What are the most reliable job sites?
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