(Note: All of this info is not absolute and is based on what's know in the story until this point, as such it will be updated once obsolete or proven inaccurate.)
(Note-2: There are some small pieces of information that have yet to appear in the story here.)
First of all, the level of magic skill like light magic, being level 1 or 2 or 4 or whatever only defines what spells you can use and how well you can use them, because your elemental affinity and mastery are increased by those skills.
Magic spells are divided into grades that go from beginner to God. Each grade is divided into tiers from 1 to 3, 1 being the simplest and easiest and 3 being the hardest in that grade.
Two spells being from the same grade and tier does not imply that they are equal in power or usefulness, it only means they are equal in complexity.
Light magic:
: A spell used to create a sphere of light to illuminate dark paces. It's mostly used by people who explore dungeons, labyrinths, caves, and so on.
Spell grade: beginner, control tier.
: A distraction or obstruction spell that temporarily blinds the enemy with an intense flash of light.
Spell grade: beginner, control tier.
Fire magic:
: A spell used to create a small floating flame that is used to light up dark places. It's mostly used by people who explore dungeons, labyrinths, caves, and so on.
Spell grade: beginner, insight tier.
: A cooking spell used to create a small to a medium flame that is generally used to cook or heat food, because of how weak it is for actual battle. Most people don't use it at all, because they find it hard to control, so it is considered unusual for someone to actually cook with it, if someone actually uses it they will either be a cook, a chef, or have a magic-related profession.
Spell grade: beginner, mastery tier.
Water magic:
: A protection or capture spell depending on how it's used, but the intent with which it was created was protection. The spell creates a sphere of water with an adjustable size depending on the target as long as it doesn't exceed 10m in height or width. The water cell doesn't drown the target or stop them from disseminating with the outside, since like mentioned before it was made with the intent to protect the caster.
Spell grade: novice, control tier.
: An offensive spell that creates a sphere of water the size of a soccer ball. Its offense power is low but since it's an easy-to-cast spell, it's usually used as a distraction or in some cases a knockdown spell. Its greatest advantage as an easy-to-cast spell is that even when applied x2, or more the casting time does not change, but the mana consumption on the other hand has a big increment.
Spell grade: intermediate, insight tier.