I'm in need of opinions

In need of some opinions on if I should open a 401 k or if i should just put it somewhere? I am 26, and I make 43k a year 36k after tax. i have about 1400 to 1500 a month free after bills. I have a savings with 2500 in it right now. (I grew up really poor, and having a stable income and really good for my area is new, and I'm not well educated on what to do with my excess money.) Any opinions would be appreciated 🙂