HTML/DHTML or CSS what means every of those notions? Which one should I use for follows situation: Let say we are social networking for pets and every user have own profile where he is introducing pets. What do we need to make if we want that user can just simply copy a code or whatever is name for that to their profile on other social networking site and user from other social networking sites see in that profile an image "My pets" which will lead to profile in our site? Thanks in advance......
It might be simple html, if I understand your idea well. You'd better give some example of how it must look on "other social networking sites".
Let's say you have this social networking website, and now you want people to share their page from your social networking website on their facebook page / twitter / bookmarking / whatever ->->-> What you need is to go to each website you want people to share on, and then get the code which you can embed (using HTML) into each profile on your social networking website. I think this is what you were asking, but please elaborate if this didn't help.
Unless you're going to build from scratch, you'll want to implement a CMS like Wordpress, Drupal, Joomla. They all have plugins and modules, but implementation and customization can be a challenge.
Use CSS. It is only 3 letters long. HTML is 4 and way too long for you. DHTML is 5 and no way can comprehension set in.
HTML is a markup language which you can use to create webpage, CSS stands for "Cascading Style Sheets" and allows you to control appearance of the info on your web pages. Usually both HTML and CSS are used to create webpages/site. You can't use just CSS to build websites....