If you are interested in investing, i would advise you to max your 401k, create an emergency saving after that open up a ROTH IRA(if you make less than 120k) before investing.
Now if you have money left and want to do investing but don't have much ideas about investing world, you should buy an index fund that tracks s&p fund or mutual funds..

Or go crazy like me... 100 percent invested in mutual fund.
https://personal.vanguard.com/us/funds/snapshot?FundId=0585&FundIntExt=INT

but,you should always diversify your portfolio based on your risk tolerance..i am big fan of three fund portfolio..
https://www.bogleheads.org/wiki/Three-fund_portfolio

Or, if you don't care about money, buy life insurance from PFA and watch your money disappear.. i know tons of people working for PFA; they would be happy to assist you and earn their 75 percent commission :)

P.S i am not a financial adviser.. take everything with a grain of salt..