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Is it the kind of person who owns of diploma or certification and teaches for a living, like one would teach maths, history or biology in high school ?
I think that:
Traditionally, teachers are monks, who: live in a monastery; have studied (the doctrines) and practised (meditation and monastic discipline) before they begin to teach; teach (groups of lay people and/or other monks); are supported by local lay society (see e.g. Alms -- Buddhism).
Sometimes, former monks (ex-monks) are teachers.
Are there places buddhist like to meet, like churchs for christians ?
Yes of course.
Do I need to travel to India or Tibet ?
I don't know. I'd expect something of a language barrier if you do, and that a good beginning would be to find somewhere more local (in your own country):
Also, I just don't know whether Tibet is actually a feasible place to study Buddhism (for political reasons) -- obviously you'd want to double-check that before going! But apart from India and Tibet there are many other countries in east Asia and south Asia that are traditionally Buddhist. Different countries tend towards different schools of Buddhism. On the other hand I'd expect it's possible to find almost any/every school (or country-of-origin) represented somewhere in France.
Three more comments:
There's a lot to be found on the internet:
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Give Plum Village a try if you live in France.
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When I say, "find a teacher" I just mean, don't rely on your understanding of books alone. Go to an actual resident Buddhist master of any denomination, like a teaching Theravada bhikkhu or a Zen Master or a Tibetan Buddhism Master (Rinpoche). They usually reside at a temple (or a private residence turned into a temple) and have little sanghas formed around them. Talk to them, hang around them, and validate your insights against theirs. More often than not they got enough realization to at least check where you are obviously mistaken and point out the blind spots.
Sometimes they do lecture, like actual teachers, or do Q&A - and at other times they build personal connections with students and become mentors. Expectedly, the depth varies.
As for diploma, a good rule of thumb is to prefer someone within a tradition, who can point out their lineage, to someone who is merely self-proclaimed (with rare exceptions). They usually have some paraphernalia and entourage, e.g. my Zen master had a scroll on the wall listing his entire lineage of teachers all the way back to the Buddha, not to mention that he had converted a barn into an actual traditional meditation hall in Korean Seon tradition.
Of course being a part of tradition does not always mean the teacher is good and has complete realization. You can never know for sure, until you are a teacher yourself - but a good rule of thumb is to see if they can cut through masks and bullshit and gently touch the student's heart.
If you search www.buddhanet.info you should be able to find someone in your locality; I see a Vajrayana temple in Ardennes.
Finally, if you don't have anyone nearby, or anyone you like and can connect with, at least find a more senior fellow practitioner that can provide some guidance and support.