How to make money
With access to the knowledge of the future, governments and large companies would happily buy research that is yet to be done. Do you have an issue with the bootstrap paradox? Imagine going to Google today and giving them all of the information about their mistakes and dead-ends in the future, what makes them successful etc.
You know what a learning experience is? A learning experience is one of those things that says, "You know that thing you just did? Don't do that -- Douglas Adams.
Imagine a learning experience without having done "that thing you just did".
Imagine going back to the 1920-1930s and giving some nation of your choice all of the future science and research on atomic weapons. Imagine how many people would pay to publish the general theory of relativity before Einstein even published the special theory.
Transfer all of this information on a memory card inside a small smartphone and write it up by hand. Alternatively, the traveller can post on here asking for advice on how they could print files with technology from previous decades and devices that can fit into one's anus - it wouldn't be the strangest question to be answered here!
How to keep the money with you
The problem then is what happens to the money you earn, and how you would take it back. My answer is that you don't. Use modern day knowledge to build a condition-preserving bunker, in the past, in a permanently-remote location. Use your money from trades to buy famous pieces of art, original pressings of books/records, a model-T Ford hand signed by the man himself, with zero miles on the clock. Get back to the future, open the bunker and report the find (Donate 60% to a small town museum) to remove suspicion. The rest will make you billions.
You will be revered amongst 'normies' as an adventurer, an Indiana Jones-like character. You can pay off some companions to make some other "discoveries" to remove all media attention from yourself. You can plant stories in the past to hint of such bunkers, with sufficient mystery surrounding them to make them unfindable.
This storyline sounds like a hell of a lot of fun.