**Firstly** is an adverb that is used to introduce the first point in a list of reasons, explanations, or steps. Here are some examples of how it can be used:
1. **Firstly**, we need to decide on a date for the meeting.
2. **Firstly**, I would like to thank you all for coming.
3. **Firstly**, the weather was bad, and **secondly**, we were running late, so we decided to cancel the trip.
4. **Firstly**, I thought about studying abroad, but **secondly**, I decided against it because of the cost.
5. **Firstly**, she tried to solve the problem herself, but **secondly**, she realized she needed help.
6. **Firstly**, he wanted to go to the beach, but **secondly**, he changed his mind and decided to go hiking instead.
7. **Firstly**, they planned a big party, but **secondly**, they decided to keep it small and intimate.
8. **Firstly**, I wanted to buy a new car, but **secondly**, I realized it was not the right time.
9. **Firstly**, she was nervous about the interview, but **secondly**, she prepared well and felt more confident.
10. **Firstly**, we needed to find a place to stay, but **secondly**, we found a great hostel with affordable prices.