The at-risk rules limit your losses from most activities to your amount at risk in the activity. You treat any loss that’s disallowed because of the at-risk limits as a deduction from the same activity in the next tax year. If your losses from an at-risk activity are allowed, they’re subject to recapture in later years if your amount at risk is reduced below zero.

The Volunteer Income Tax Assistance (VITA) program offers free tax help to people who generally make $54,000 or less, persons with disabilities, and limited-English-speaking taxpayers who need help preparing their own tax returns. The Tax Counseling for the Elderly (TCE) program offers free tax help for all taxpayers, particularly those who are 60 years of age and older. TCE volunteers specialize in answering questions about pensions and retirement-related issues unique to seniors.
​Udemy is an online platform that lets its user take video courses on a wide array of subjects. Instead of being a consumer on Udemy you can instead be a producer, create your own video course, and allow users to purchase it. This is a fantastic option if you are highly knowledgeable in a specific subject matter. This can also be a great way to turn traditional tutoring into a passive income stream!
Similar to making a website or blog, but more passive, is creating an online course. If you have a specific skill you know you can teach and that others want to learn, you can easily create an online course. Sites like Udemy can help you do this. It requires some work to make it, but after that, users simply need to sign up for the course and pay a fee.
Net royalty income from intangible property held by a pass-through entity in which you own an interest may be treated as nonpassive royalty income. This applies if you acquired your interest in the pass-through entity after the partnership, S corporation, estate, or trust created the intangible property or performed substantial services or incurred substantial costs for developing or marketing the intangible property.

Add Leverage (Mortgage) and you greatly increase the ROI especially from the perspective of using Rents (other peoples money) to pay down the mortgage and increase your equity in the property over time. At this point then yes price appreciation is secondary bonus and we have an arguement of how and why Real Estate can be better than Growth Stocks in some scenarios and for some investors.
One of the most appealing options, particularly for millennials, would be #12 on your list (create a Blog/Youtube channel). The videos can be about anything that interests you, from your daily makeup routine (with affiliate links to the products you use), recipes (what you eat each day) or as you mention, instructional videos (again with affiliate links to the products you use). Once you gain a large following and viewership, you can earn via Adsense on YouTube.