A marked stitch is a stitch where you have placed a knitting marker. A pattern may tell you to place a marker at a certain stitch, and to do some particular thing in a subsequent row when you come to that marked stitch.
Are you knitting? If by basic stitch, you mean garter stitch, it is because you are knitting on both sides of the work. It may also mean your working yarn is in the wrong place when you attempt to pearl a stitch. A stockinette stitch is achieved by knitting on one side of the work and pearling on the other. When knitting, the working yarn should be at the back of the work, away from you. When pearling, the working yarn should be pulled between the needle and the work,( closest to you) and then work the stitch the same as a knit stitch. This should fix your problem, but if not, please ask more questions.
Yes, because you are knitting two stitches from the same stitch.
Cross stitch is a form of embroidery. (Cross stitch designs are done on grids, so they look like they might be for knitting. You could probably use some cross stitch designs for intarsia or fair isle color knitting.)
Knit to the 1st stitch before the marker.
No, in knitting MS does not mean front and wrong side of the row. MS means moss stitch. In this type of stitch, you knit two two rows of the same sequence (purl or knit) and then alternate them.
There are many kinds of stitches in knitting. There is normal stitch, purl stitch, garter stitch, stockinette stitch, ribbing stitch, seed stitch and lots more. Loads of stitches are actually made up of other stitches merged, chopped and changed.
Pass slipped stitch over. E.g. SK2P = Slip one stitch, K2tog, pass slipped stitch over the stitch just worked. -- thus decreasing by 2 stitches.
Yes.
Purling is knitting the purl stitch.
K-O in knitting means "Knit Over" or, in other words, pass one knit stitch over the next.
K-O in knitting means "Knit Over" or, in other words, pass one knit stitch over the next.
In knitting, sl1 means to slip one stitch. To do this simply slip the stitch from the left hand needle to the right without knitting it. Stitches can either be slipped purlwise or knitwise. If slipped purlwise, the stitch will not twist but if slipped knitwise it will twist. Therefore, if the pattern does not specify which way to slip the stitch, it is best to slip purlwise. See the related link for a diagram showing how to slip stitches.