A lot of material has been printed on (the white side of) the French Tarrasch since 2006, for example:
How to beat the French Defence
Andreas Tzermiadianos, Everyman 2011, 320 pages
https://popularchess.com/products/how-to-beat-the-french-defence-the-essential-g... Playing 1.e4 - French Defence and Sicilian Sidelines
John Shaw, Quality Chess 2018, 293 pages (out of 384)
https://qualitychess.co.uk/products/opening/318/playing_1e4_-_french_defence_and... Modern Chess Opening Repertoire for White
James Rizzitano, Gambit 2021, 26 pages (out of 175)
http://gambitbooks.com/books/Modern_Chess_Opening_Repertoire_for_White.html And otherwise for Black:
3…Nf6 :
GM Repertoire 16 - The French Defence Vol. 3
Emanuel Berg, Quality Chess 2015, 257 pages (out of 462)
https://qualitychess.co.uk/products/opening/219/grandmaster_repertoire_16_-_the_... 3…c5 (4.ed5 ed5) :
The Modernized French Defense - Vol. 2: Against the Tarrasch
David Miedema, Thinkers Publishing 2020, 215 pages
https://thinkerspublishing.com/product/david-miedema-the-modernized-french-defen... 3…c5 (4.ed5 Qxd5) :
Playing the French
Aagaard & Ntirlis, Quality Chess 2013, 79 pages (out of 464)
https://qualitychess.co.uk/products/opening/190/playing_the_french_by_jacob_aaga... 3…Nc6:
The Modern French Defence Volume 1: Tarrasch and Various Lines
Dmitri Kryakvin, Chess Stars 2020, 96 pages (out of 224)
http://www.chess-stars.com/resources/French_cont_1.pdf + + +
Maybe I overlooked something. And, of course, there are online courses and special databases.

tracke