This is all great advice in this thread that I can vouch for. If you have more questions post more threads - this investing stuff is more or less a “solved” math problem so you’ll generally get “the right answer” from anyone in this community.
There’s also more to learn beyond what to buy and where it goes. You should also look into the psychology and strategy of Boglehead investing. You’ll need the nerves/rationality to never ever sell your stocks or react to market changes in any way. Don’t even look at the market or your money ideally. Set a course and trust the math. The best way to lose invested money is by touching it. The more you touch it, the more you lose. Index fund investing is so simple that you may feel anxious that you are not doing enough - this is normal and it’s important that you don’t start fiddling with your money by e.g. tilting towards tech or trying crypto etc.