Q.orchid care
We have two ‘moth’ orchids that were gifted to my mum. It bloomed quite a bit and then the stem were the nodes were dried off. Is this a usual occurrence and will the stem regrow?

When the flower stem is done blooming, it can be pruned from the orchid.
Here are some articles that will help you care for your plants.
https://www.gardeningknowhow.com/ornamental/flowers/orchids/how-to-prune-an-orchid.htm
https://www.gardeningknowhow.com/ornamental/flowers/orchids/phalaenopsis-orchid-care.htm