Chess.com isn't that complicated once you get used to it, but I get that it can feel overwhelming at first with all the menus and stats everywhere. The thing is, you shouldn't start by jumping straight into games. Before that, you really need to nail the basics: how each piece moves, elementary tactics (forks, pins, discovered attacks), and especially learn to recognize patterns. If you skip that step, you'll get destroyed in five moves and you'll quit - it's the classic story.
What I'd recommend is combining an app with videos. Lichess is free and honestly more accessible for a beginner than Chess.com - the interface is less cluttered and it has a solid puzzle system built in. Puzzles are the most important thing at first. Do like 10-15 minutes a day of puzzles before you even think about playing. At the same time, watch a few YouTube videos on basic opening theory (like simple principles: control the center, develop your pieces, castle early). French-language channels exist and it's way easier to follow than reading text when you're starting out.
After two or three weeks of doing this, you'll feel like you already understand way more about how the game works. That's when you can start playing against the computer on an easy level or against humans in blitz (fast format). The key isn't to chase perfection right away, it's to have fun and improve gradually. People who get discouraged too quickly are the ones who want to analyze 50-move games on day one - nah, chill out, learn the tactics first, the rest follows naturally.