+1
Read Stixrud and Johnson's books. They are phenomenal: smart, sane, and wise.
+1 to the comment about mental health.
-1 to the comments about making spreadsheets and resumes.
+ 1 to the comment about finances: know where you stand on college and communicate your plans clearly and early.
For my oldest, we did a single college visit the summer after freshman year, since my kid had never been on a college campus before and I thought it would be useful to have some frame of reference once we got to talking about colleges. That was helpful.
Otherwise, remember that we are raising adults, not children. Google one of those "things every kid should know by the time they're ___" lists.
Respect their agency.
When problems arise, ask whose problem it really is.
Along those lines: Put your own oxygen mask on first. Manage your own anxiety. Do whatever you can to keep the ghosts from the nursery.
Show, don't tell: Model your family's values. Practice managing adversity. Show them what a life well-lived looks like.
Focus on your own relationships: They are preparing to leave the nest, after all. Build your own networks, support systems. You'll have more freedom once they're in high school than you've had in the past: Show them how to use that freedom wisely.
Enjoy!! And try not to blink 😊