The Advance French is a great weapon against 1.e6. Except for the exchange variation, it requires least learning of all the main theoretical lines.
Learn the basics of the French Defense, common variations & ideas for both sides in this introductory video: https://youtu.be/pig559oP5OM
The Exchange French: https://youtu.be/YlA3heOMMN0
The Tarrasch French: https://youtu.be/IGS68T5FmvM
The Winawer Variation: https://youtu.be/NWFL6b38BUQ
The Rubinstein Variation: https://youtu.be/THkLmg9vmv0
The Steinitz Variation: https://youtu.be/PuI4MWpDe2U
The advance variation is an easy option to start with against the French Defense because the aren’t that many options black could go for. If you are looking to simplify matters in your e4 repertoire, the Advance French should be the way to go.
The variations starts after the moves:
1. e4 e6
2. d4 d5
3. e5 – advancing the pawn and gaining space in the center. Black really only has one move
… c5 – immediately crashing through white’s central structure and pushing his strongest pawn break.
4. c3 Nc6
5. Nf3 – at move 5 black gets to choose a variation, and he is the first side that decided which direction play is going to go in. There are three main moves for black:
5…Qb6 – the main line and the most aggressive option
5…Bd7 – the Euwe Variation
Players whose games you should study: Alexander Grischuk, Fabiano Caruana, Alexey Shirov, Sergei Zhigalko, Evgeny Bareev, Baadur Jobava