Cross-stitch is a beautiful and simple art that is easy to learn. However, becoming proficient requires practice through completing several pieces. At the beginning, everyone should adapt tutorials to their own style to find the best method that suits them. Don't rush, take it slow!
Simply put, cross-stitch consists of two stitches in opposite directions forming an "X". Hence, in English, it's called "Cross Stitch". In a simple embroidery piece, the stitches are likely all "X"s. But as the work becomes more complex, more stitches will be involved. However, cross-stitch is considered simple because there are few types of stitches commonly used: Full Stitch (Cross Stitch), Half Stitch (Half Cross Stitch), 1/4 or 3/4 Stitch, Back Stitch, and French Knots.