Question: what is the best way to invest in index funds?
Answer: Check your 401(k) ... 
If you don't have a 401(k), open an IRA. ... 
Consider a brokerage account. ... 
Decide what market(s) you want to invest in. ... 
Check the minimum investment amount. ... 
Look for index funds with expense ratios around 0.5% ... 
Fund your account. ... 
Set up automatic contributions.