Source: https://www.foosgavinlaw.com/areas-of-service/criminal-defense/drug-charges/proposition-64-legalization-of-marijuana
Timestamp: 2019-04-22 14:21:20+00:00

Document:
It is still illegal to distribute marijuana to people under 21. It is also still illegal to drive under the influence of marijuana (Vehicle Code § 23152(e)). Using marijuana in public, smoking marijuana where tobacco is prohibited, and possessing marijuana on school grounds is still illegal. Using marijuana while driving or riding in a car is still illegal, as is having an open container of marijuana in a moving vehicle. Making butane honey oil without a license is still illegal.
It appears that it is now legal to drive with less than one ounce of marijuana in a car, but this is still an unsettled area of the law.
HSC § 11359- Possession of marijuana for sale – Will be reduced to a misdemeanor with a sentence of no more than 6 months in jail. However, if one has two prior convictions for this offense possession for sales can then be charged as a felony with a maximum sentence of 3 years in state prison.
HSC § 11360 – Sales of marijuana – This is now reduced to a six month maximum misdemeanor, but also is priorable and can be charged as a felony if there are two prior convictions.
HSC § 11358 – cultivation of marijuana of more than 6 plants by someone over the age of 18 but under the age of 21.
There will be no reduction or dismissal for someone who had been convicted of a violation of HSC § 11357©, possession of more than 28.5 grams of marijuana. This offense will still remain a misdemeanor with a maximum sentence of six months in the county jail.
There will a reduction in possible sentence for a conviction of for HSC § 11357 (a), possession of more than 8 grams of concentrated cannabis, from a possible one year in jail, to a possible 6 months in jail. However, the offense will still remain a misdemeanor.

References: § 23152
 § 11359
 § 11360
 § 11358
 § 11357
 § 11357