What educational qualification is required for France work permit visa?

I have a few serious international travel questions, and the airport can't answer them when I called to ask. I have never traveled internationally in my life. So I don't fully know what to expect when I arrive. I have obtained a Algerian visa, which was not easy to get. I couldn't make that flight a year ago  when my host sent me a invitation letter to come. The expiration date says it's good till July of 2024. Can I still travel there even know its been a year since i got the invitation letter from my host and he's still good for it? I also don't know what questions the Algerian customs will ask me?