Please consider any "Transfer Student Guides" you might find in your school's website and/or social media pages.
An example of this is Hunter College's New Student Guide for Transfers, which offers new transfer students some resources, important deadlines, and tasks to complete to prepare for their first day of class.
If you are a CUNY community college graduate, or simply a CUNY transfer student seeking to attend another CUNY school to continue your degree, please keep in mind that transferring to another CUNY college requires that you apply to the college(s) of your choice.
That is, from the CUNY website, you will have to select "Transfer Student" instead of "New Student" to create a Freshman application.
If you were accepted into a 4-year senior CUNY college and changed you mind about applying to it and would instead prefer enrolling into a CUNY community college (that you did not apply to), you can email the CUNY community college's admissions office and request that your acceptance be transferred to that college instead.
Because your admission and acceptance into a 4-year senior college is often more rigorous than that of a 2-year community college, your acceptances are often considered, and admissions offices are happy to help with this type of transfer!
You can consider moving your acceptance from a 4-year to a 2-year school if you find yourself running out of time register for classes, or that it will be more costly to enroll in a 4-year school over a 2-year school for a different degree.
If you are a SUNY/Private college student seeking to attend a different SUNY/Private college, you can apply through the school's application portal or an undergraduate college admission application (like Common App).
At SUNY, there is a process called "Reverse Transfer" for students who have already transferred to a SUNY four-year institution without having earned an associate degree at a SUNY community college.