Since you are French resident, I am assuming you can only buy UCITS ETFs. I think following link might be useful for you
Wiki UCITS ETFs
In addition, for brokerages, following have been recommended as best ones in general depending on which type you are looking at. This is from Swiss resident perspective. I think you should check if you have specific needs which only French brokers can fulfill (like tax documents etc), then perhaps check for French brokers