Ninja 300 Service and Maintenance

To the ninja 300 owners I would like to know your bikes -

1] First service Cost

2] Any major service or part replacement in further servicing

3] Major anomaly or issue noticed after having your bike for long time.

To all the riders -

As we all live in the same city and face somewhat the same road and riding conditions one or the other way, I would like to know if there's anything you need to keep doing and also avoid doing for the bike to keep it healthy and maintained.

Please provide your valuable suggestions.