Hi Avegail –
In a nutshell, when you use the HSA account to invest in real estate, any proceeds from the real estate investment go back to the HSA account so it will grow. There’s a lot more than that obviously but under the Premium Training section here in the website there’s also training that I am pretty sure touches on this subject.
You can also go to youtube and do a search for “IRA real estate HSA” or something like that and you will find some pretty good videos that will help you understand this concept better.
There are also many IRA companies out there that offer free webinars and training videos all the time that are very helpful. You don’t have to open an account with them or anything like that if you don’t want to but it is an easy way to at least get a better understanding.
Hope this helps.
Rafael