I haven't learned a great deal, though that is not because there isn't a lot of information on this forum; there is. It's simply because this single guy who is a renter, and only owns a bicycle, a campervan, and a cat, didn't need to know much to secure a happy retirement with a consistent income. It's the 80/20 rule - 20% of the knowledge gave me 80% of the results. The main things I have learned -
1) That I can achieve a consistent income in retirement with a simple portfolio that requires very little maintenance (thank you FIRECalc and index funds),
2) That it's important to consider the tax consequences of my financial moves,
3) That when W2R goes Whee......well, you know
There are, of course, many other things but, for me, these have been the most important ones. Well, the first two were anyway