Learning your lines.
Learning your lines is often one of the most difficult tasks an actor has to undertake. Knowing the words and reciting them. What's more, you'll have to do it with every acting job you have. Reading and reciting, however, can make this task quicker, more bearable and more successful.
One good tip in learning your lines is to read each scene aloud (including the lines of all the other characters) seven times in a row. Performing this activity will activate three areas of the brain. In reading the lines, they are committed to your visual memory; hearing your own voice commits them to your auditory memory and saying the lines commits them to motor memory. Essentially, the lines are filed away in three different areas of your brain. If one fails to come up with the lines when you want them during the performance, one of the others will help out.
You should also read the entire play through at least once a day to ensure you know and retain your lines and familiarise yourself completely with the flow of the story. If you know the play inside out, you'll have the added benefit of knowing where the story is going at any time and will be able to help your fellow actors out if they stumble or stall.
While learning your lines it tends to help putting rhyme and rhythm to them. It's not always easy to add your own rhyme, but adding your own rhythm to the lines can aid memorisation. Additionally, using acrostics to remember orders of words such as a list of names or the order of a certain list can help. Similarly, using acronyms to remember lists can also be helpful. Visualise the words you're speaking and create loci to help you remember sequences of names or words.