What is Theme?
Theme is group of images, php files, CSS(Cascading Style Sheets) files used to give graphical style to you whole website. The website or blog designing on WordPress is totally depend on Themes. Good news is that you need not learn php or CSS. WordPress themes are ready made available on the web. You just need to upload it. How to get themes? WordPress currently provides 3 predefined themes: twenty twelve, twenty thirteen, twenty fourteen. You can see these themes is Appearance –> themes. You can activate any one theme and your website will look according activated theme.
Add new themes :
You might not want these three themes. WordPress provides plenty of themes by clicking on add new option. Add Themes page will open and Snapshot featured themes will be show. Popular and latest themes are also available. There is another option named as ‘featured filter’. You can filter your search in form of colors, layout, features, subject and then click on apply filter. Themes will be shown according to filter selected by you. If You liked any theme you can preview and install and activate.
You can also download theme from https://wordpress.org/themes/. You will get theme in zip format After download theme you need to upload it by clicking on ‘upload theme’. This option is also available on add theme page where you seen featured themes. click on upload theme and then choose file.and then install.