Hello Yordano911,
If you are new to gold farming, an easy way to get started is using the azyul dungeon farming profiles. These are 100% afk if you dont run into any problems and they make great GPH. Some of these dungeons were fixed though to have less GPH, but there are still a few making over 1000gph.
If you are botting with just one account, it's great to find a good farming spot that gives you mats for your professions. I used to do herbalism and skinning and farm nagrand in an area with lots of beasts to skin and herbs would pop up all the time too, not to mention the furs, and epics that would sell for over 50k gold and they drop bones you can turn in for more gold, I have an automated profile for this if you want it just message me.
The best gold farming techniques will always be the ones that no one else is doing. If a great gold farming technique goes public and everyone uses it, then it's likely to get fixed by blizzard quicker and not be as profitable. Get creative, look through forum posts for what others are doing and put your own spin on it.
Hope it helped!