Haven't read all the comments in this thread so I apologize if this has already been mentioned. I just thought I would put a plug for some books that were very helpful for me for retirement planning that would be useful for a new grad.
"A Random Walk Down Wall Street" by Burton Malkiel.
- Helped establish a good foundation for efficient mark hypothesis
- Explained the principles behind what you should look for in investments
- A long read but an easy read with historical context which I thought was interesting
- Looks at the performance of different types of funds over time and points out their important elements which made them successful investment choices
"The Four Pillars of Investing" by WIlliam Bernstein
- Written by a neurologist so I felt like I had that physician-physician connection
- Helps re-enforce the principles of "A Random Walk Down Wall Street"
- A shorter read but still also an easy one
- Mentions a lot of specific funds to give you a starting place
- Also goes into investments outside of 401k and IRA once you have maxed out those utilities
TLDR: Index funds good, low expense ratios good, once max out 401k and IRA ---> go for tax efficient vehicles. Compound interest is extremely powerful. These books teach that.
There is also the Bogleheads forum which has been helpful to read other people's stories through financial planning. Makes you appreciate how fortunate we are compared to the rest of the nation at times!