Minimum Battery:
22 rifle
12ga Double barrel/pump
38/357 revolver
9mm quality semi auto
30-30 rifle.
Lessons on how to use and deploy these weapons properly. You can hunt and fight just fine with this group.
IF you think you are a Mall ninja a EBR will be necessary too.
If you think you need more caliber, better look at the problem a lot harder, get better training and quality practice. Then look again.
Any quality weapon in any of these classes will work just fine. The rest is simply a matter of environment and/or subjective prejudices. Not better not worse, just subjective and situational.
Some very few places a 308 or 30-06 might be a better choice to do what the 30-30 will and has done effectively for over 100 years.
On the other hand if this becomes your hobby, God help you. Most of us with the disease have 50 to several hundred rifles, shotguns, and handguns. They have turned into fairly good investments. Watch what happens when they try to ban them, and when their value will sky rocket when the super inflation related to the uncontrolled spending of the recent congress hits us. And it will. The laws of economics are immutable.
As the economic situation worsens, and it will, we may need our firearms like never before. At least have your minimum battery.
That's it.
Good luck.
Fred