Best free online business is Affiliate Marketing ( Digital Marketing) now follow these steps:

step one: head over to clickbank join for free 
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step two: after you join , they will want you to make up a(  ID  ) The id will be your code linking to you so they know who to send commission to. Make your id long to protect yourself from hackers, example of a long id = (ty9gfdsewqabhuimgres55ccuyt) this is only a example to show you how to do it. 
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step three: 
now head over to marketplace in clickbank upper right corner. click on marketplace, search through all the products you can promote, find the product u want to promote, then read about the product and then click promote button to get your link, which will also have your id in the link. 

step four: 
now this click bank link is to long, were going to shorten it, by heading over to: tinyurl , 
put the long link in box then click button below. to shorten it to 8 letters.
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step five:
now you need to make up a ad campaign to put ur link in, so people can click on it and you recieve a commission. so head over to CANVA . 
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step six:
now head over to free ads to post a free ad campaign. you can google ( free ad posting) on
google search engine. But to give you a head start here are a few that really pulls in the sales
Freead1


check out the tools in website