Provided the tank is large enough to house them all (1 inch of fish needs a minimum of 1 gallon of water) Guppies and Bettas should get along OK.
Yes, with lots of plants in the tank
Almost any community fish will do fine with guppies. Bettas are not a good idea with guppies because they will fight each other.
In most cases, it is not recommended to keep guppies with female bettas. Female bettas can be quite territorial and may perceive the guppies as intruders. This could lead to aggression and potential harm to the guppies. It's generally best to house guppies with other peaceful, non-aggressive fish species.
Male bettas should be kept alone. Female bettas can sometimes be kept with other fish, but in a large community tank. Bettas need their space!
Bettas are agressive towards smaller fish, so neither.
No the two male bettas will kill each other if they are put in the same tank.
you can put two girl bettas in one tank but not the males
What are guppies
I wouldn't recommend any other fishes.
bettas cant be in the same tank together because bettas wher ment to fight eachother or diffrent aquatic animals.
yes
If the tank is large enough place a separator in the tank if not move them apart. 1 fish one tank.