Lash Tech Certification

Hi, ladies! I'm wondering if any of you are certified Lash Techs? How do i know what schools are legit & safe? I've seen some courses nearby that are 1 day classes, and idk, that seems sketchy because I feel like it takes more than 1 day to learn ??

I think I'm interested in trying it out, since I have heard you can make pretty good money from it. Is that true? If possible, please give me an estimate of how much money you bring in per week. Thank you guys so much!!!