Bonjour
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In French, the word for "hi" is "salut." It is a casual way to greet someone.
Salut
In French, you would greet a teacher by saying "Bonjour, monsieur/madame" (Hello, sir/ma'am) or "Bonjour, professeur" (Hello, teacher). It is important to use the appropriate title based on the teacher's gender and position. Additionally, using formal language and showing respect is customary when addressing teachers in French-speaking countries.
bonjure nito
bonjour monsieur
Chinese students typically greet their teachers by saying "老师好" (lǎoshī hǎo), which means "hello teacher." They may also address their teachers as "老师" (lǎoshī), which simply means "teacher." It is common for students to show respect to their teachers by bowing slightly when greeting them.
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There are many ways in which you could greet a guest. You could always greet a guest with a simple hello.
It would be good to know Spanish and French or Italian and French That way you can teach more classes and get a better chance at a job.
Native teachers would have better understanding in how to engage the students. Foreign teachers, depending what the lesson is, might know the subject better. For instance a french teacher teaching french language.
You can say "Bonjour Maître" in French to greet someone as "Hello Master."