Even if you do not believe in any kind of TEOTAWKI or WTSHTF events happening in your lifetime you may be starting to see how you could end up in a disaster that will last for an extended period of time. Examples of this could be a hurricane or earthquake.
Destruction can be so extensive that it will require a long time for things to return to normal in your area. That can mean you will have to deal with chaos for a while.
Preparedness for long term disasters is different than for short term disasters. Long term preparedness requires more planning and a different way of thinking and looking at your planning.
Supplies, infrastructure to get more supplies in, and financial structure can all be in short supply for a long time. This means that if you are ready for a barter economy in your disaster area, you and your loved ones will be better off than if you are not prepared for a barter economy.
You can plan to have extra essential supplies to barter during a long term disaster, but they will eventually come to an end and might not be replaceable. Having a skill to produce items that others will want or need during a disaster could be more helpful to you than having a finite amount of extra supplies to barter.
Some of the skills that you already have may be useful for barter. Part of your disaster planning could be taking a look at the skills that you and your loved ones already have.
If you and your loved ones do not have any skills that might be good for barter in a long term disaster, you can pick a skill and develop it.
Survivalists and preppers have many views on what kinds of skills might be good for barter. This blog post does not begin to have enough space to go into detail about what kind of skill you should develop for your own use and for barter during a long term disaster.
Medical care is a skill that is always in demand during disasters and should include alternative medicine. If you know the herbs in your area and are well stocked and know how to get more, you can barter those skills and take care of your needs and those of loved ones.
That is just an example to get you started. You can look at your own likes and dislikes for what skill you might like to develop. If you think a certain skill might be helpful during a disaster, others will probably need the same thing.
If you can not afford to go to school or pay to learn a survival skill for barter, then look on the internet. You can learn almost anything you really want to learn on the internet for free. I already wrote a post on the use of search engines for preparedness. That can include preparedness by learning a new skill. You can look on the internet and learn that new skill.