A great way to learn new knitting stitches is to look for free dishcloth knitting patterns! There are tons of these free patterns all over the web with really interesting stitches that you can learn! Many are in English and provide written instructions instead of charts!
Bobbles, Cables, Colorful Knitting Stitches, Embossed Stitches, Knit & Purl Stitches, Lace, Reversible, Ribbing, Ripple Stitches