… or indeed, going to school or college for the first time…
If you think that your child may go to school at some point in the future, know that most home-educated children have no problems, academically, in slotting back into school, even if they were very autonomously educated or not following the national curriculum.
Many home-educated children are academically at or above their school-going peers.
What they may find different with, or occasionally have difficulty with (if they have never been before) is the school rules (such as asking to go to the toilet before leaving the classroom), test-taking, stamina for handwriting for large chunks of the day.