To get a variety look of your website you can install other themes on your blogger site. Sometimes you find the different use of it. However, to do that you should save and download the previous one for the safety of your writings and other property.
Choose the theme you like to install
You can find browsing the internet many websites offer you themes freely. In this case, you have to choose a right one which is compatible with you, I mean you should choose one which would be suitable for your site. Think about your website, and make a decision on suitability keeping a margin with that what your website is made for. For instance, you may have made your website designing to sale health product or beauty or anything else, now you should choose one matching in your presentation of the products, as you want to show them for your visitors. Because every theme is for a specific strategy, so choose of your own.
How to setup theme
Open your browser to search free template for your website. Here is one, write on the address bar "blogger free template" then you find in the search page written as "blogger template 2018" or many other sites that offer you the free templates for downloading, installing and using them.
Now, start downloading a theme, you will get a zip file, extract it and keep it in a folder.
Then click the folder and you can see different files, you have to choose the XML file to upload. Now, go to your blogger dashboard, here you find the option, click on the "theme" after that go to the right upper corner where written as "backup/restore'' a popup will open, choose the download or backup first if you needed. Download means if you wish to backup your previous theme, you can choose the download option before for downloading, and then clock on "brows" you find your extract theme files, select the XML file then from the popup click on the "upload", this is all to upload a new theme for your website.
For your better understanding you can see YouTube videos, there you find a lot of youtube videos that guide you how to set up/install other themes in your blogspot.com.
Misbah Farazi
Now, start downloading a theme, you will get a zip file, extract it and keep it in a folder.
Then click the folder and you can see different files, you have to choose the XML file to upload. Now, go to your blogger dashboard, here you find the option, click on the "theme" after that go to the right upper corner where written as "backup/restore'' a popup will open, choose the download or backup first if you needed. Download means if you wish to backup your previous theme, you can choose the download option before for downloading, and then clock on "brows" you find your extract theme files, select the XML file then from the popup click on the "upload", this is all to upload a new theme for your website.
For your better understanding you can see YouTube videos, there you find a lot of youtube videos that guide you how to set up/install other themes in your blogspot.com.
Misbah Farazi