I have been instructed to use them in patterns for button holes, during the process of decreasing, and for strengthening edges.
Here is a video tutorial on how to do a slip stitch:
Among my favorite yarns to use is Caron One Pound Yarn.
Whether you purchase it in the store or online, it is an economical way to go for large projects that use worsted weight yarn.
Jump to the other Tutorial pages in this series below:
How to Crochet - Free Stitch Instructions and Abbreviations
How to Understand Crochet Pattern Codes and a Printable List of Abbreviations
Buying the Right Crochet Hook and Free Metric, US and UK Conversion Charts
How to Crochet a Slip Knot (sl knot) Stitch and Starting Chain (ch)
How to Crochet a Single (sc) Double (dc) Triple or Treble (tr or tc) Stitch
How to Crochet a SLIP STITCH (sl st or ss)
How to Crochet Single (sc dec) and Double Decrease (dc dec) and (sc inc) (dc inc) Increase Stitches
How to do the DOUBLE CROCHET DECREASE (dc dec)
How to Fasten Off - Hide Crochet Ends - Change Yarn Colors
How to Crochet in Front (fl) and Back Loop (bl)
How to Crochet Back Post (bp) and Front Post (bp)
Basketweave Crochet Stitch using Front Post Double Crochet (fpdc) and Back Post Double Crochet (bpdc)
How to Crochet a Cluster Stitch (cl)
How to Crochet a POPCORN Stitch (pc)
How to Crochet a PICOT Stitch (p)
How to Crochet a LOOP Stitch (lp(s))
How to Crochet a BULLION aka RICE aka ROLL Stitch
How to do a CROSSED DOUBLE CROCHET (cr dc) or Double Crochet Crossed
How to Crochet a PUFF Stitch (ps OR puff st)