Actual instructions are big for an internet comment, and dependant on your specific situation and needs. I’ll recommend some reading.
If you don’t want to spend a lot of time.
Go straight to The Index Card
Bonus points if you read Pound Foolish first.
They aren’t long. They explain what to do, and what not to, respectively. They were kind of written as a pair.
If you’re willing to take a longer journey.
Start with The Richest Man in Babylon, explaining why investing is a good.
Then read A Random Walk Down Wall street, describing all the ways you could invest, but probably shouldn’t.
Then move onto the other two I mentioned first.
If you read all of them you’ll know more about finance and investing than 90% of people.
These books are all quite US centric, but the basic principals are the same everywhere. Though some of the tax advice you’d want to check into locally.
We’d really need to know what the 30 options are, to recommend one.
But I’d really recomend against it. The point of an HSA is to have cash available for medical expenses and emergencies. Over the long term (decades) index funds do consistently trend up. But on any given day, you never know. Money you were expecting to be there might not be. Now you’ve got a whole other problem.
If you have more money than you can imagine needing in the HSA, pick something with slow consistent growth and low or zero volatility.