im hoping someone can explain to me what F1, F2, ... etc means im getting ready to order some seeds and i need more info to choose. Thx

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anything i say here is false due to my wild imagination which i got from being a crack head

F1 i'm pretty sure is Sativa crossed with cannabis ruderalis. the result is a plant that flowers reguardless of photoperiod(12/12 for example).

Can't vouch for the accuracy but I found this:
HYBRID
By crossing two not related plants you will create a hybrid. These newly created plants are called F1. If the F1 plants are backcrossed to the mother then their offspring often will be called F2. Also F1 crossings between brothers and sisters are called F2 and sometimes even crossings between F1 plants of different lines are called F2. I presume however that, in most cases when breeders are talking about a F6, they mean by this that the plant was backcrossed for 6 generations, this to reinforce the properties of the mother. But be aware, this plant will probably not be stable. Even not if it is a F20. What you best can do is to select the plants that you like the most and use their clones for growing and blooming.
THE STRENGTH OF THE HYBRID (HYBRID VIGOR)
With "HYBRID VIGOR" is meant something like the strength of the hybrid. This is however only the case with a crossing of two stable plant lines (the plant is then on important properties homozygous and therefore true breeding). The F1 plants that you produce in this way will be all identical and very strong. Because of this, an enormous improvement on certain characteristics can arise. So it can be for example that these F1 plants grow much more rapidly or produce bigger buds then their parents. Another advantage of this F1 is that all plants will be identical. Selection of the best plants is of course not needed anymore. The strength of the hybrid will however decrease if you go on with breeding. A F2 is therefore qualitatively lesser then the F1. This because of the recessive alleles that nicely hided in the F1 and can come forward in the F2. Furthermore the offspring of F1 plants will no longer be identical.

Here: ENOBLING - BREEDING - F1, F2, F3, F4, F5, F6, Weed Cannabis Grass Pot Marihuana Marijuana Hemp Seed Seeds

so which is better an F1 or a an F6? lower number or higher?

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anything i say here is false due to my wild imagination which i got from being a crack head

F1 crosses

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Is A She