Trig help

I understand how to use them, but can someone clearly explain to me when to use all the different formulas in Trigonometry? (For e.g: how I can tell when to use Cosine rule)

Cosine rule:
2 sides + enclosed angle to find opposite side
or 1 side, angle, and side opposite to the angle to find other side enclosing the angle.

Sine rule:
Angle and opposite side + side to find the other opposite angle
Angle and opposite side + angle to find the other opposite side

Sine area rule:
To find area you need 2 sides + enclosed angle
To find a side you need the area + a side and the enclosed angle

In right angled triangles:
Sine:
To find angle you need opposite side + hypotenuse
To find hypotenuse you need angle + opposite side
To find opposite side you need angle + hypotenuse

Cosine:
To find angle you need adjacent side + hypotenuse
To find hypotenuse you need angle + adjacent side
To find adjacent side you need angle + hypotenuse

Tangent:
To find angle you need opposite side + adjacent side
To find adjacent side you need angle + opposite side
To find opposite side you need angle + adjacent side

Sorry if I made a mistake or my description is bad

Not completely correct -

Cosine rule:
Three sides - use to get largest angle [oppostie largest side]
Are you sure about the seond use of cosine rule - draw a diagram as it doesn't sound correct.

I understand how to use them, but can someone clearly explain to me when to use all the different formulas in Trigonometry? (For e.g: how I can tell when to use Cosine rule)

do you have any for c3 and c4 trig?