Child is attending school online. Can I show the payments made in 2024? Like you can a university.

 But probably not. Schools that only offer online courses usually do not qualify.  Online classes taken at schools that also have  classroom instruction usually do count.

 To be eligible for the tuition credits, the course must be taken at "an eligible institution". The school should be able to tell you if it is an eligible educational institution. In general, an eligible educational institution is an accredited college, university, vocational school, or other postsecondary educational institution, including accredited, public, nonprofit, and proprietary (privately-owned, profit-making) postsecondary institutions. Additionally, in order to be an eligible educational institution, the school must be eligible to participate in a student aid program administered by the Department of Education. If they issue a 1098-T they are probably an eligible institution.

Enter your school at the link below, to see if it's on the dept. of education list.

   https://www.savingforcollege.com/eligible-institutions   

It depends. Qualified Education Expenses - Internal Revenue Service paid to a Eligible Educational Institution - Internal Revenue Service are deductible.