The first one is books. Go to a book shop, and find a book on personal finances, written by a registered financial advisor in your country, for your country. It'll be long, stuffy, boring as fuck, but you'll likely come away well informed. I think if you're reading HN this would suit.

Second one is personal financial advisers. You want to talk to an independant one, who's not tied to a company that's actually selling financial products. They shouldn't be paid a percentage commision (also called trailhead) on your money - I never understood how somebody can be 'acting in your best interests' if they're paid by how you invest. You should pay them by their time, like you would a doctor. Except it'll cost like $200

You also want a personalised financial adviser. Some advisors say like the one you'd find it you went to a bank, or a mortgage shop have a limited scope - they're only allowed to give advice about the bank's products, or mortgages specifically. You want full picture. Sometimes employee assistance programmes if you have that will actually get you a few free sessions with an adviser, use them.