Cheap and wide indexfunds. Think global and as cheap as possible.
I like Länsförsäkringar global indexnära as a base. Combine with some emerging markets and some home bias and perhaps some small cap.
Rikatillsammans standardportfolio for long time investing looks like this.
70% Länsförsäkringar global indexnära
10% Länsförsäkringar tillväxtmarknad indexnära (emerging markets)
10% Plus allabolag Sverige index (home bias)
10% Handelsbanken Gl Småbolag Ind Cri A1 sek (global small cap)