One of my favourite subjects~~~~~~~~~~~~~~
Basically you cant get rid of them but you can restrict them -find their hiding places- bits of wood, garden debris,under pots,dark places where they hide in the day-go out in the dark with a torch you will see them on the plants-pick them of and dispose- early this morning they were about.
If you anti. the blue pellets there are wild-life friendly ones available
You will never get slugs or snails out of your garden- but it is fun trying