Probably not for you. TN is more flexible since it doesn't come with 6-year limit like H1B. For many employment based green card(GC) applications, it's a 3-step process that consists of Labour Certificate(LC), I-140, and I-485. There is no conflict to apply for LC when you hold/renew TN. It's probably also ok to apply for I-140 when you have TN. However, you can't renew TN after you I-485, which is last step of GC application. You need to have H1B or EAD at that time.
2.当我换工作时, H1 和 TN 是不是都要重新申请? H1 将占用新公司的名额吗? 我知道TN 申请很简单,只要拿offer,在边境签即可.
Yes.
3. 关于TN 的renew,我可以austin办吗?
I believe so. However, my info is quite old (a few years back.) You'd better to check it with reliable source.
border 是指有美国海关的机场或边境关口吗?
Yes.
我这里离墨西哥近,到那个边境可以吗?
Not sure.
4.如果他们帮我申请H1,我要自己负担费用,我是否该比较一下H1的费用和TN 的renew(包括交通费)?
多谢了先!
You are welcome.