First, who’s a noob? A newbie or someone with little to no knowledge of a concept/field. Everyone’s a noob at something, so it’s definitely not a bad thing.
If you’re working on something and you have some level of understanding and expertise on it, try asking a noob for his/her opinion on it.
They’ll give you an unfiltered review of what you’re working on. You’ll easily know if it’s simple enough for a noob to understand or too difficult for them to comprehend.
If you’re building a product, you’ll know all its intricacies but the real test begins when it’s given to a noob. Someone who isn’t familiar with the product.
Can they use it easily? If yes, congrats you passed the noob test. If not, you got work to do.