Hello i've seen this and was curious just now what is LS?
Is there a newbie thread or directions of what to do to get started? or even what ls is?

Top right of the screen it says “Ladder Slasher” click that and you can start playing

As to a guide I think there’s one around here! On mobile atm, but you can just search (or google) for it

try it out. create a character and start killing
EE on weapons and armors, upgrade every 5-10 levels
str or dex on charms based on weapon type

here are some links
https://forums.d2jsp.org/topic.php?t=84187466&f=74