This. Very important, and this process is made much more effective if parents or teachers or other adults are with the young on that journey to coach them. Not easy to do online as you need to see the young people in their everyday interactions.

"But the Internet will never replace teachers."

I'm not sure. The point isn't to replace teachers, is it? You can get to great teachers, mentors and peers through other means, schools aren't the only source of teachers for the young.

You can follow thinkers, business people etc. online, and reach out to them or their communities, and that effectively can act as a teacher.

You can actually meat with people who become your teachers/mentors because you engaged in online activities.

None of these require an institution, and specifically, poorly run schools will actually promote groupthink and monoculture. It's good balance to get some experience and 'education' outside the regular system for diversity.