Section § 20

Explanation
If you held a job position that was created by old laws but is still around under the new laws, you can keep that job just as you did before.
All persons who, at the time this code goes into effect, hold office under any of the acts repealed by this code, which offices are continued by this code shall continue to hold them according to their former tenure.

Section § 21

Explanation

This section means that if a legal action was started or a right was established before the education code came into effect, those won't be changed by the new code. However, future steps in those cases should follow the new rules as much as they can.

No action or proceeding commenced before this code takes effect, and no right accrued, is affected by the provisions of this code, but all procedure thereafter taken therein shall conform to the provisions of this code so far as possible.

Section § 22

Explanation
If you have a license or certificate from a law that was repealed, your rights are not taken away. You can still use those rights, but you have to follow the new rules in this code.
No rights given by any license or certificate under any act repealed by this code are affected by the enactment of this code or by such repeal, but such rights shall hereafter be exercised according to the provisions of this code.

Section § 23

Explanation

This law says that if you were eligible for a certificate or credential under a previous law that's no longer in effect, you still qualify for a similar certificate or credential under the new rules, as long as the new rules apply to your situation.

All persons who, at the time this code goes into effect, are entitled to a certificate or credential under any act repealed by this code, are thereby entitled to a certificate or credential under the provisions of this code so far as the provisions of this code are applicable.