Telephone and QQ consultation are not enough.
Don't just consult by phone and QQ! Although employees of each company will praise their own company, you can ask each other about their positions to see if their professional level matches their positions.
Field trips are very important.
Carefully study the school's website and related materials, and then conduct a field trip! Many training institutions will exaggerate to attract customers, so it is very important to make a field trip to see if they can really provide the technology and knowledge you need.
Whether the practical facilities are complete.
Practice is an important part of learning technology. Ensure that the school provides enough practice opportunities and professional practice teachers to truly master the technology.