Totally.
Never sell.
The original Boglehead, in my mind, was a guy named Taylor Larimore. He was kind of the unofficial leader of two forums, one on Morningstar and one standalone at Bogleheads.com or maybe Bogleheads.org (can't remember).
This guy really impressed me. Understated but insistent that if you:
• Start young (20s best)
• Save at least 10% of income
• Dollar cost average (basically buy all the time, every week no matter what)
• Keep your costs rock bottom
• Don't outsmart yourself (market timing)
...you will have plenty to retire at 65.
I followed him religiously for a few years, and after I felt I understood what he was teaching, kind of dropped off that forum. There are some tax nuances I don't really understand, and I should probably get help with. Where you hold different kinds of investments really matters, and I don't fully understand that. If you have enough to save outside of your tax sheltered options (401k) go super efficient, like a low cost total stock market fund. That much I know.
I followed most of that advice, except I didn't start in earnest until I was in my 30s. Was too busy being a starving artist, but hey. Before I got married I saved like 35% of my income for about 10 years and that compensated somewhat, but not as much as starting in my 20s would have. Hard to have your shit together in your 20s, but it is what it is.
Not to be an asshole, but I laugh when I read something about "how does xyz news event affect your strategy." It doesn't. At least not for me.