Any Mommy Couponers out there!? How do you save BIG!?

Victoria
Kind of out there but im going on non paid maternity leave really soon and need to save $ where i can! Do any of you moms use alot of coupons and save A TON of money? Where do i start? Ive heard of check out 51, ibotta, mobisave...are there anymore? I know how to use cartwheel for Target and i just downloaded the kroger store one too. Please any advice or how to find these coupons and stack them and use these rebate apps would be WONDERFUL! Or share what sites you use/started with to get your couponer hobby started. Thank you so much for your time and i know other moms will benefit from this post too!!!!!