Is the screen actually touch-enabled?

Yes. The 15.6-inch 1920x1080 display is a touchscreen, so you can tap, scroll and use touch-friendly apps directly.

Does it have an SSD or a hard drive?

It uses SSD storage, which means faster startup and app loading than a spinning hard drive.

Is a 15.6-inch touchscreen laptop too big to carry?

It is fine for moving between rooms or occasional commutes, but a 15.6-inch body is heavier than a 13- or 14-inch laptop and better suited to desk use.

When is the best time to buy it?

Laptop prices move around sales events, so check the price history before buying.

Is the HP 15.6 FHD Touchscreen Laptop worth it?

Only if the touchscreen matters to you. Non-touch HP 15 models with similar screens and SSDs usually sell for less, so you are paying a premium for touch.