Sigils are a interesting subject due to the uses of them in energy, they themselves are practically just constructs attached to something physical. The real kicker is even someone who is not aware of energy could use them without realizing due to how it works, even just staring at them can allow you to use them depending on how they are set up.
Sigils can be used for any subject really, but they can get really complicated depending on how advanced they are just like constructs, on that simply induces a emotion is relatively simple, but one that causes wards to form on people is a LOT harder.
But, let’s get on to the creation of them.
The first method is the most commonly used and honestly it is probably one of the most inefficient in terms of creation, you decide the meaning of the sigil first off then you get one of each letter in it, so say this. “Induce Fear” “Inducefar”, then you use said letters and construct a shape out of them while willing this to happen.
This method is terrible in my opinion so I suggest not using it.
The next method is instead using any shape as LONG as it is unique in some way, and then taking a bit of construct programming in raw form and attach it to the symbol, this can be used for a lot of things, and is one of the most effective methods imo.
The next method is really complicated and isn’t really the one you should start out with, it is emotional sigils, these sigils are created in a way that they need a specific shape. Get an idea of what you wish to do and then convert it in your mind to “emotions”, really odd to do but it is possible, then will the emotions into your hand and just start drawing according to them while also imbuing the symbol with the programming/emotions.