Tell me about your terrier

We adopted a terrier mix puppy a few months ago, he's 5 months old now and I love him. Training is going great, but this is my first time raising any puppy, and I've come to learn that terriers are a little bit harder to train supposedly. I want to hear about your journey with your terrier, some pitfalls to avoid, things that work well, stuff they love, the pros and cons of their personalities in your opinion, and your perception of how they're different from other dogs!