Starting my first job

Hi everyone, I'm about to start my first corporate job and I'm feeling a bit nervous. I'm kind of awkward socially and not totally sure how to handle things like small talk, workplace etiquette, or being seen as someone who contributes without overstepping. I really want to avoid making dumb mistakes, build good relationships with coworkers, and be more visible in a positive way. If anyone has tips on surviving the first few months, being professionally “present,” and not coming off as weird or fake, I’d really appreciate it. What are some do’s and don’ts you wish you knew when you started out?