You do not need complicated vocabulary to taste beer. Pay attention and find words that make sense to you. A clean glass, good light and an unhurried moment are enough to start.
Look, smell, taste.
Observe the colour and foam without assuming a dark beer contains more alcohol. Bring the glass closer and look for aromas: bread, fruit, flowers, coffee or spices. You do not need to identify them all; one clear impression makes a useful note.
Separate a few sensations in the sip: sweetness, bitterness, acidity, body and finish. What stays afterwards? Does it feel light or dense? Is the bitterness short or lasting? Compare your notes with the style description and what the brewer intended.
Your taste matters.
A style not being your favourite does not mean it was poorly made. An IBU number does not tell the whole story either: malt, body and balance affect how bitterness feels. The most useful question is often simple: what do I enjoy about this beer?