"I am turning 18 soon, I have an account shared with my dad, but are there specific funds I should invest in? For example, Roth IRA, Target Date Fund, and should I invest in foreign markets/am I even old enough to do that? Or should I stick to investing in companies I think will do well and stick to those?"

Congratulations on having the interest and means to save and invest at a young age! I absolutely love helping people get started with investing especially at a young age. You have a super power on your side: time! Compounding interest really is the 8th wonder of there world.

I recommend the following general points

• Roth: Use Roth accounts as much as possible. Tax-free-forever!
• Low-Cost Index Funds: Understand the different classes of assets and their historical performance. 
• Individual Stocks: If you want to invest in companies, go for it! Learn about investing while you are not risking "too much" and more importantly, how you feel about making (and losing) money. 

Matt and Mike discuss the situation of this young person and how to get started. Resources include:

• 90 Years of Performance
• Four Asset Classes with Great Long Term Returns

Find out more about Mike at https://www.mortonfinancialadvice.com and connect at https://www.linkedin.com/in/mwsmorton/