Working back and forth. An example of this is the SameYou tea-towel
Working in rounds. An example could be a bucket hat or a round bag.
Before getting started it is important to know, that the names/terms in crochet vary from country to country. Most importantly there are different terms in British and the USA.
On the left I have borrowed a chart showing the differences. In my patterns and tutorials I will be using UK terms.
Chain (ch)
Slip stitch (ss)
Double crochet (dc)
Half treble crochet (htr)
Treble crochet (tr)
Double treble crochet (dtr)
Triple treble crochet (trtr)
Raised tr. back
Raised tr. front
Increase (inc)
Decrease (dec)
Changing color