I think up business ideas. Is this an appropriate forum just to post business ideas every day?
Absolutely. We do ask that you keep the self-promotion for any one particular company to a minimum, but if you're just looking for feedback on potential ideas, then yes, you may definitely use this forum for that.
You can review the community guidelines here: https://community.startupnation.com/discussion/12951/community-guidelines
If you want to start your own business then you can start an online business. in this business, you can launch your store on an online platform. Make your store online and sell your goods to a large number of people.
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What business would you like to start? I agree that you should start an online business as the capital required is much lesser than the operating a physical store. They are plenty of free courses and ebooks about starting up an online business. You won't have any issue getting this information. All the best!