The general guidelines are on the IRS website, Form 709 Instructions.
https://www.irs.gov/pub/irs-pdf/i709.pdf
Verify everything with a tax preparer. For 2022 you may give up to $16,000 per person per year without any tax implications. No limitation to the number of people. You can give more but giving more requires you fill out the IRS Form 709 to file with your taxes and it counts against the lifetime gift amount.
Since you can transfer to multiple people, you can transfer $16,000 to each child, their spouse, and each of the children each year without any tax filings. Each check has to be in a different person's name but you could transfer up to $64,000 to a family of 4. Now, if you are married, your spouse can also transfer $16,000 to each of those same people too and still no gift tax or tax paperwork to file for you or the recipients. So a married couple could transfer $128,000 a year to a family of 4 without any tax implications.
You can also pay for a child or grandchild education tuition and it won't count against the gift amount as long as the money is paid directly to the institution. You can't give them the money to pay for it and then they pay the tuition. It also doesn't apply to books, supplies, room, board, etc. Tuition only. So you could pay for a grandchild to attend a private school and it wouldn't count against the gift amount.