Hi ive just started learning to crochet and im so confused-bought a book that i just got through the post today and the stitches are named different from the ones i learned off the internet

for instance....single crochet i thought was hook through, Yo ,pull through 1 loop then YO and pull through 2 loops

But in this book thats called a double crochet? and it doesnt cover the single crochet?

A slip stitch on the net was Hook through Yo pull through 1st loop then pull 1st loop through 2nd loop?looking like wee V shapes

But in the book a slip stitch is hook through Yo and pull through 1 loop only

Can anyone help me?? im so confused as dont know what is right or wrong so i cant follow patterns!!

Id be so gratful for your help as ive kinda hit a wall until i find out more on this!