I use an Internet Provider that supplies me with 2 Gb of data for 3 days (4 if extended) for a basic price. In order to get the best value from this allocation, I deliberately exclude advertisements as far as possible. The Opera browser I use was one of the first to offer to block adverts, and is very effective.
In some cases, the site I am trying to access refuses to send the requested data unless they are allowed to send adverts also. If I think it will be useful, I can turn off the block for that particular site. It is easy enough to put the block back on once the data has been received.
However, adverts are not the only thing that is going to consume lots of bandwidth.
Originally, the WorldWideWeb was able to transmit text only, and the ability to send images came later. Now, however, it is almost impossible to find a site without images, as everybody wants to send them.
If you take a site like the Daily Mail as an example, (https://www.dailymail.co.uk/home/index.html), you will be bombarded with images as well as text. Unfortunately, many, or even most, of these images do not add significantly to the value of the information you receive, and could well be discarded.
Even the more conservative news sites will send a picture of the person who is the object of a news item, and how many copies of Boris Johnson’s image do you need? If you have seen one, you have seen them all!
The answer is to stop downloading images altogether!
In Opera you go to “Settings”,”Privacy and security”, “Site Settings”, “Images”, where you will find the controls to set this up.
Although you are able to block or allow images from specific sites, I choose to simply turn all images off. If you find there is an image that might be of value to you while browsing, I suggest you get the URL of the image, take off the block, download the image, and put the block back on. It may be a little effort, but in terms of the bandwidth you are saving I consider it well worthwhile!