1. YOU TUBE ADSENSE
To earn from youtube adsense you should be necessary that your youtube channel monatisation must be on then only you can see on your video that promotion videos can come or you can tell youtube adsense
Why different different mobile different video comes when talk about on youtube adsense?
So here is answer of your question
You can see different advertisement on different mobile because youtube will provide adsense video through your previous searches or previous cookies,etc.like
For example-i search best digital marketing institution in Delhi so what ever institution if they paid money to the you tube, then you play any video in that video their institution advertisement comes that you should be comes that our institution is best it gives facilities etc.in that way your YouTube ad sense will be finish
For the native ad`s it should necessary your traffic must be good in your channel then only it can be work and native ad`s is also known as sponsored ad`s and if you have no traffic And you wanted do native ad`s how can possible that audience will see your ad`s it should be necessary that audience must be in thousand or in million then only it can be good.
In the native adds,if you think that you want to promote your business,or anykind of apps ,banks etc. then you have to paid money who is promoting your business or any apps on their video Like tiktok paid money for promoting their app.
but condition will be apply in that situation because it should be necessary that subscription should be in millions then only native adds can be work on promotion.
3.ANY ONLINE CLASS LIKE UPSC, SSC PREPRATION
If you are professional person it will be very good for you to make one online channel
slowly slowly you can create it wide
If your profession is to prepared a competition exams and your local audience is good then it will be good for you to that you can take online classes from institution ,it will help you to incease your income
You can take online classes also from youtube and different classes you take differences fees according to classes like railways classse preparation feers is different ,ssc classes fees is diiffrent ,upsc classes fees is different and from different different class you can take different money and in easy way you can earn money from homes their is no need to go anywhere .