Internet is an indispensable part of today's society. It has brought revolutionary changes in convenience, information and communication, but it is also accompanied by some gains and losses.

First, you must:

1. Information convenience: The Internet makes it extremely convenient to obtain information. We can get all kinds of knowledge and information anytime and anywhere, which facilitates our study, work and life.

2. Communication: The Internet has greatly expanded people's communication methods. Through social media, e-mail, video phone, etc. People can communicate across time and space and bring people closer together.

3. Business development: The Internet has brought huge opportunities and development space for business. The emergence of e-commerce and online services has changed the traditional business model and made the interaction between merchants and consumers more convenient.

4. Innovation and development: Internet is the source of innovation, which has spawned many new industries and technologies, promoted social development and progress, and injected vitality into human scientific and technological progress.

Second, the loss:

1. Overflow of information: There is a large amount of information on the Internet, including many false and misleading information, which puzzles people's cognition and causes information overload and confusion.

2. Privacy leakage: In the Internet age, the security of personal information has been challenged. Privacy leakage and data security have become a big problem, and personal privacy is often easy to be stolen and abused.

3. Social problems: Although the Internet makes people's communication more convenient, it also leads to the virtualization and isolation of people's social interaction, and the opportunities for face-to-face communication and real communication are reduced.

4. Internet addiction and security issues: Some people may be addicted to online games and social platforms and lose control of real life. In addition, there are security problems such as fraud and pornography on the internet, which have a negative impact on the growth of teenagers.

The development and application of the Internet has brought a lot of convenience to people's lives, but at the same time, we need to be alert to the possible risks and negative effects. While enjoying convenience, we need to improve our information discrimination ability, protect personal privacy, make rational use of Internet resources, avoid falling into Internet addiction, and realize healthy, safe and orderly use of the Internet.