First of all, in French like in all the other Roman languages there is the differenciation into feminine and masculine for all things. They have articles and different endings in adjectives. This can make things quite difficult. How to know, whether a table is feminine or masculine? Well, simply, one has to learn it by heart. Whenever you hear a new word, you will remember the word together with the article. Then things will get a lot easier.
Secondly, the tenses are more complex than in English since Roman languages know a subjonctif, which is a mode that is not really known to the English language, expressing non-reality, wishes, desires and fears. And again here there is a surprising difference in French language compared to other Roman languages: French does not use subjonctif for conditional clauses. We will come back to this later.
