This is not allowed and is unauthorized employment. The L only allows you to work for the L sponsor.

Petition for Alien Relative (Siblings) - Birth Certificate issue (incorrect Birth Date)?

go ahead and file now with birth certificate and other documents showing correct birth date and indicate the correction of the birth date is pending.

Can I apply my spouse's H1 B to H4 COS & H4 EAD along with my H1 B transfer to different employer simultaneously?

Yes this is done all the time; if your employer won't pay the fees fo ryour dependent you can offer to pay and request everything be submitted...

Can my wife stay in the US after we file the i-130 petition? I am an LPR and she is here on a B1/B2 stamped in until December.

You can maybe extend her B-2 for six months longer but after that she would need another nonimmigrant status to remain as you likely won't be a...

How can I get a second TN visa for this side-job (online blog)? (where to apply? how to justify it? Do I need a sponsor?)

TN's must be employees and cannot be independent contractor. You could set up another legal entity and hire a manager and that entity can then...

Can an individual with an EB-5 visa manage their business part-time or must they manage the business full-time to keep the visa?

If it is a direct project rather than a Regional Center USCIS will want to see that you are managing and directing the business but this doesn't...

Stay in US from L1B -> H4

You need to file the I-539 ASAP making sure it is received by USCIS no later than August 13 -- be sure to include proof that you have maintained...

Can I get a work permit while waiting for a I-30 petition?

The work permit goes with the I-485. You are not eligible to file for the I-485 until your Priority Date is current which is likely 12+ years in...

Any requirement for sponsor on income, Tax paid , Taxable Income, AGI...?

Need to demonstrate income equal to 125% of the Poverty guidelines for your family size and/or assets equal to five times the difference.

Can I change status from a visitor visa to a J2 visa without leaving America?

Get the DS-2019 for yourself, pay SEVIS and this can be done. If you are applying for J-2EAD this can be filed concurrently with proof of need to...