What kind of bass do you have? What kind of sound do you want? Strings change the sound and feel of your bass. There is a big question of personal taste when selecting strings. If you have a long scale fretted bass, then if probably go with something like this. Fender 7250 Bass Strings, 40-100 https://www.amazon.com/dp/B003B0CHDO/ref=cm_sw_r_apan_glt_fabc_VGF6ZKBRJ80Z4XWHZVTS They are my personal favorite strings. If you like eb, then Ernie Ball Regular Slinky Nickel Wound Bass Strings - 50-105 Gauge (P02832) https://www.amazon.com/dp/B000MFL7UU/ref=cm_sw_r_apan_glt_fabc_WNZ2MYCBMJ2PW4J8NNK0 are good also.

Short scale and fretless need different strings. Players with a soft touch want thinner ones and players that dig in hard what heavier strings generally.