The Harry Potter d20 setting for the most part uses the skills found, in most d20 fantasy games. Spellcraft, has been removed as has Use Magical device as most spells are now recognized, by making appropriate Knowledge checks. Magic items are also far easier to use, and unless noted need no special training to be used.
Craft (wand)- This allows the person to create different types of magical wands. Having 5 or more ranks in Knowledge (wand lore) adds a +2 synergy bonus to all Craft (wand) checks.
Knowledge (Int; Trained Only)
Knowledge is actually composed of many different skills much like Profession, and Craft. Knowledge represents some type of study in a given area.
Below are several different types of Knowledge
Dark Arts- forbidden knowledge, and protection against the dark arts, knowledge of Curses and Anti-Curses, dark wizards.
Charms- knowledge of charm spells, knowledge of people who made developments of spells
Magical Creatures- types of magical creatures, habitats of magical creatures, uses for magical creatures
Magical History- Famous and Infamous witch's and wizards, wars, government, magical locations
Transfiguration- Different types of Transfiguration magic, famous wizards and witch's, different uses
Knowledge (wand lore): knowledge of wand construction, magical cores, and tree wood types.
New Profession
Profession: (wandmaker)
Synergy
If you have 5 or more ranks in Knowledge (Dark Arts), you gain a +2 bonus to casting Curses and Anti-Curses. The same applies to Charms and Transfiguration with the appropriate knowledge and skills.
Check
Answering a question within your field of study has a DC of 10 (for very easy questions), 15 (for average questions), or 20 to 30 (for really tough questions).
Other New Skills
Broomstick (Dex)
This skill allows the person to ride upon a broomstick, and to do complex maneuvers as well. Higher, points in this skill allow for a greater control of the broomstick at high speeds.
Command Up 10 - You can make your broomstick jump from the ground, into your hand.
Guide with Knees DC 15 - Using your knees you can control the broomstick only using your knees. This allows you to use your other two hands, freely. Failure, on this check results in only one hand being free. If the person is rising in the air, or diving the DC increases by 5.
Curses and Anti-Curses (Cha)
Divination (Cha)
Herbology (Wis) Synergy- Having 5 ranks of Herbology or more grants a +2 to Potionmaking
Potionmaking (Int)