Secondly, you can learn about related product knowledge, both online and in books. Which company is harmless? Noise, dust, mechanical damage, etc. Only the degree is different, and the protective measures are different. As you know, GCL has done a good job in labor protection.
Third, if you are timid, can you do one thing well? Hearsay is also a way to understand, but choosing a credible channel should be more important!
I hope I can help you!