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I'm fascinated by the FIRE 'movement'. It's certainly not for me (I can't be THAT frugal, and I came across it a decade or two too late), but there are some crucial lessons for all of us regarding financial freedom, and it's a significant part of my financial turn-around.
Here's how it works:
In essence, earn more, buy less, and invest the difference.
The way the maths works, based on historic US stock market returns:
Live off half your income, invest everything you can in a global tracker, and after 9 years, your pot should be enough for you to draw down 4%/year to live off, without running out of money.
Like most things in life, it's simple, but by no means easy.
It really depends on starting out on a pretty good salary (the most famous 30-something retirees tend to work in Tech in the US), and continued good stock market returns. The latter is doubtful for several reasons.
For those interested in personal finance coaching, https://www.mrmoneymustache.com is the best place to start, though very US-centric (so for example, the talk of tax-advantaged accounts isn't relevant to the UK). MMM's blog, however, will make you think differently about major purchases, ultimately enhancing your money management skills. I re-read some favorites a couple of times a year to keep me grounded!

Financial coaching