Warriors get a different talent tree from Mages, and there are no 'spells' on it, and a Warrior has no mana anyway.
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There is no such thing as a witch on The Sims 3(yet...), but you can cast spells by going on to TheSims3.com, then go to the store and buy Lady Ravendancer Goth's Book o' Spells. Then install it into your game. That way you can cast spells.
Wizards cast magic spells in every RPG, or roleplaying, game as that is an accepted standard of the class. Some RPG games this applies to are Runescape and World of Warcraft.
There are no 'spells' in vanilla Minecraft, just enchanting tables.
To memorize spells in baldur's gate - I assume you are talking about the PC game - open up your spellbook. On one side, you can now see the spells you have available in your spellbook. On the other side the spells you already have memorized and those you are going to memorize are displayed. With a left-click on the spells in your spellbook you can select those spells you like to memorize. A right-click on those you already have will remove them. After adding the spells you want, you can see them, but not use them at once. They will be available for you to use after taking a rest. So either do a normal rest in the wilds or pay for a night in an inn. In Baldur's Gate II, there are two more options available: Cast the lvl 9 spell 'wish' and select the option that your party has just rested (which is not always available). This last option is the only available resting option you can use during a fight but since you can completely reload all your available spells and daily abilities during a fight, this is the most powerful one. Nonetheless there is a way to restore your spells without resting: spell trap. This powerful spell (which is also a daily ability of the 'staff of the magi') protects you from spells up to an accumulated level and at the same time restores your own spells, so that you can cast the restored spells again without resting.
You click on the spellbook icon, then click on a spell to cast it. Some spells may require to to cast on some object; for example in the case of a combat spell, you must select what you want to attack. For combat spells, it is better to choose the "autocast" option (right-click on the spell), to quickly cast the spell repeatedly. Most spells require items called runes, which you must buy, find or make. Moving the mouse over a spell will show you which runes you need. The runes are used each time the spell is cast, so you need a relatively large number of runes. You can save some runes by wielding a special staff; for example, one of the most basic combat runes requires air runes and mind runes. By wielding a staff of air, you save the air runes - but you will still need to buy the mind runes.