You can create YouTube channel using just a mobile. You can create any types of video and upload to youtube.
You can monetize YouTube videos and earn money online.
There are some requirement to monetize you channel.
You can create blog/website where you can post articles and earn money using google adsense.
Affiliate marketing is promoting some other websites product and getting some commission if someone buys product clicking after links from your website or channel.
Once you get traffic to youtube or website you can get more benefit from affiliate marketing.
In drop shipping you can sell product without having inventory.
You can offer paid services online like web design, graphic design, development etc.
If you are good at anything you can create course and sell on digital platforms/websites.
Now days everything from creating demat account and buy/sell share can be done online.
A single mobile phone is sufficient to make money from share market