While French has the same alphabet as English, some of the letters have little decorations that can make them look and sound very different. In French, accents are essential: they're there for a reason, so you must include them when writing.
If you want to read and write in French, one of the first things you should learn is the alphabet. Fortunately, French has the same 26 letters as English. Unfortunately, most of the names of letters are pronounced differently, as are many of the sounds.
Contractions occur when two words are combined into one, sometimes with a distinctly different spelling. In English, contractions like "won't" are optional and indicate informality. In French, however, contractions are required, regardless of the register you're speaking or writing in.
An elision is a type of contraction that occurs when two words are combined: one or more letters are dropped and replaced with an apostrophe. In French, written elisions are required, regardless of the register you're speaking or writing in.