Understanding marijuana and using it properly is important.
Years ago i used to smoke a lot of pot, but all I knew was that I was smoking pot. When I picked up my medicinal card earlier this year, I started to learn about this magical healing herb.
The two dominant strains are the Sativa and Indica strains. Everything else is a hybrid variation of these two strains.
Sativa's are best used during the daytime. Different strains will have different effects, but in general, sativa's offer a more energetic effect.
Indica's are best used at night. Again, different strains will have different effects, but indica's generally tend to provide a sleepier effect.
I tend to buy Sativa's that are 25% or more Sativa dominant and Indica's that are 25% or more Indica dominant. I don't generally play in the middle ground, with a few exceptions.
The best methods for consumption are either as edibles, or via Vaporization. Joints, pipes, etc are all fine, but they include much higher health risks. If you are already a smoker you may not care, but if weed is all that you are smoking, use a vaporizer. I LOVE my Pax (by Ploom).
Vaporization is immediate and will provide a peak effect for up to an hour (depending on the strain and quality of your bud) and a residual effect that could last up to two or possibly even three hours.
Edibles take anywhere from 45 minutes to 1.5 hours to kick in, but when they do it happens all at once. Edibles can provide a peak effect for 4 to 6 hours or so, again depending on the quality of the material that the edibles were infused with. It ramps down from there, but it's not unheard of for edibles to continue having an effect that last 8 hours or more. You MUST be careful with edibles - sometimes it's tempting to eat one quarter of a pot brownie and say 'I'm still not feeling anything', so you eat the whole thing. You may not get the effect you were looking for if you overdo it like this - plus, you're just wasting your weed!
I prefer not to use edibles anymore. I WILL NOT DRIVE UNDER THE INFLUENCE. Taking an edible means that I am stuck for pretty much the entire day - or I need someone to cart my ass around from place to place. If there's an emergency I may not be able to drive... I just don't like the limitations it imposes. Edibles are good if you're going to be somewhere all day anyway though. I also avoid edibles late at night - it often gives me a hangover of sorts the next morning.
There are also concentrates and a whole host of additional forms of consumption available, but for the purposes of getting some relief from cannabis, the above approach has worked wonderfully for me.
Favorite Sativa: A really nice Durban Poison!
Favorite Indica: Doesn't matter - I'm going to sleep

Links:
https://www.leafly.com/ (database of strains and dispensaries).