You can find free French lessons online and good ones at that. If they’re limited in any way it’s that those I’ve found can really only deal with the French language at the beginner level. Going on from that I’m afraid you’ll have to pay. That said, there are some extremely good systems Rocket French Review out there and many of those you can get a free sample of so you can try before you buy. Well worth looking into when you want to take your French lessons to the next level.