A useful starting point is this: choose the light that fits the job.

Continuous light lets you see the effect directly, which makes placement and adjustment easier. It can be a good choice when precise positioning matters and light output is sufficient. Flash/strobes are often more practical when you need more light, lower power draw, or a more affordable way to get strong output.

Modifiers mainly control softness, spread, and direction:

• larger/spread-out source = softer light, gentler shadows
• smaller/more direct source = harder light, crisper shadows and highlights

Typical roles:

• umbrellas: broad, simple light spread
• softboxes: softer, more controlled light than umbrellas
• beauty dishes: more directional than a softbox, often used for a punchy but flattering look
• reflectors: bounce or shape light
• honeycomb grids: narrow the beam and reduce spill
• barn doors: flag and shape the beam direction

This topic is very broad, so a beginner-friendly way to learn is to start with one portable flash and experiment with a few basic modifiers. Practical tutorials such as Strobist’s Lighting 101 are often recommended for understanding what each tool does in real shooting situations.