Q.Rhododendron Flowering
I have been told by my neighbor that my rhododendron bush only blooms once a season, that it’s a philodendron that blooms all summer. Is she right?

Depending on the species, cultivator, and climate a Rhododendron can bloom anytime from early spring to late summer.
If you plant several varieties you can have blooms all season long.
A Philodendron is a green plant, grown in most cases as an indoor plant.
https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/rhododendron-care.htm
https://www.gardeningknowhow.com/houseplants/philodendron/caring-for-philodendrons.htm