If you're feeling lost in life, like you're living for no real purpose and without focus then The Second Mountain could help you start on a pathway to finding that purpose outside yourself. I found the sections on marriage and community particularly interesting as they lead to a bunch of other ideas and resources look up because I'm interested in building strong communities and having a strong marriage.

It wasn't until I had looked back through the notes though that I really understood what a Second Mountain life was. Part of this is because his best definition of it comes at the end of the book. Once I had that in hand and looked back at the content I had already covered I saw the point he was driving at. On that point I felt like the book was a bit hand-wavy throughout and that you'd get more from the other resources mentioned, but I haven't read those yet so I can't say for sure.

If you're interested in building a strong life in one of his four areas, I'd certainly recommend reading them and using them as a jumping off point. I'm not sure I can recommend the whole book though.