Is the Nike Hybrid RN good for beginners?

Yes. It is a neutral, cushioned road shoe aimed at everyday running, which suits new runners building up easy miles. Runners who overpronate should look at a stability shoe instead.

How does it compare with the Nike Pegasus?

The Pegasus is Nike's long-running daily trainer with a more established cushioning setup and a wider following. The Hybrid RN is a simpler neutral option with similar everyday intent but less of a performance reputation.

Can I use it for walking and the gym?

It is a road running shoe, so it works for walking and light gym use. For heavy lateral work or lifting, a flatter, firmer trainer is a better fit.

Does it fit true to size?

Nike running shoes generally run true to size, and this model follows that pattern. Try your usual running-shoe size and allow a thumb's width at the toe.