as this is used machine their is no booklet for knowing how to use the machine, i cant understand the keys like --A- FULL SPIN, b-half spin, c ,d e,f,g,h and also the numbers 12345678910 11 12,
What you need is the User Guide - you could ask here for a user guide but be sure to enter the make and model of your machine - it's usually quite important to include it.
"Full Spin" probably means spinning the drum to squeeze water out of the clothes for a long time so that the clothes are quite dry.
"Half Spin" probably means a lesser spin that you might wish to use on more delicate items.