THE BASICS OF MAGIC
Magic is a fairly simple skill in that all of the spells are listed in the magic spellbook interface, located on the right hand side along with the other buttons.
There are many small icons in this interface that represent the spells. Any icon that is not lit up is a spell that you either do not have the required runes/staves for, or you do not have the required level to cast it. If a spell icon is lit up, you have both the required runes and the required level and thus can cast that spell.
When your cursor is hovered over a spell icon, the information on that spell will be displayed through a box on the bottom. The name of the spell and the Magic level requirement is shown, and just below it is a brief description. At the bottom are the rune/item requirements for the spell. The numbers below tell you how many runes/items you need to cast the spell.
If the number below a rune/item is green, the requirement for that rune has been fulfilled. However if a number is red, you will need more of that rune/item to cast the spell. When all of the numbers are green and the icon is lit, you have all of the rune and item requirements to cast the spell.
Casting a spell is also simple. Left-clicking a combat spell allows you to autocast that spell, meaning you will automatically keep casting that spell when you attack an enemy, while casting only once is done through right-clicking and selecting cast. For any other non-combat spell, autocasting is not possible.
Note that this is reversed for Ancient Magicks; left-clicking a combat spell icon on that spellbook will allow you to cast once, while the autocast option can be activated by right-clicking and selecting the option.
A button on the bottom with a shield icon allows defensive casting, meaning the experience gained for magic damage will be split between Magic and Defence experience, where for 1 damage dealt, 1 experience point will be given to Magic and Defence. There are also other buttons that let you toggle the visibility of combat, teleport, skill-based and miscellaneous spells, as well as the option to organise your spells based on combat, teleports or level in a