Hi Majdi,
- Try to remember things about your colleagues such as their childrens' names, where they go on holiday, how they take their tea/coffee. This will help you build relationships more easily and show your colleagues you value them.
- Consider personal hygiene and illness when interacting with other people.
- Be kind and respectful to absolutely everyone, even if you're having a bad time or don't regularly interact with that person. People will only take you at face value and may not know what you have going on but you are always accountable for how you present/engage with others.