The Host is a person with remote access to that server and the knowledge and ability to make it function correctly. The more facilities you require on your website, such as statistics, shopping, etc, the more the hosting service costs. Web site pages are what people see when they visit your website. Text, images, links, etc, are all on web site pages. Browsers are the types of software facilities that people have on their computers to allow them to view the internet and all it's websites.
Browsers are all different, with different size screens, formats, etc, etc.
Some are supplied by Microsoft, Netscape, AOL, Freeserve, etc. A website must be easily viewed no matter what browser is being used, and many websites are not. Image creation includes scanning a photo or drawing, resizing it to fit the space on the browser screen, and then optimising it to make it good looking and fast downloading. Search Engine lists are made up according to what is submitted to them from each website. The better the submission, the higher the rating, and the nearer the top a website comes, the more likely it is to be found by people using Search Engines.