To capture your notes, ideas, links, images, files… and access them from any computer or your phone create an Evernote account (you must be 13 or over).
Evernote is an excellent application and has millions of users; apps are available on many platforms.
Once you have an account set up you can easily add a new note
Notes can be organised into notebooks; to create a new notebook select the drop down arrow then new notebook.
Experiment by adding some notes, you can add a link or a file to a note.
You can copy and paste images into a note or drag an image file from your computer into the main body of a note. You can add tags to notes so you can easily find them again, Evernote has a very powerful search function.
You can use the web application as you are doing now or you can download a desktop application as well, you can also download an app for your phone.
Windows User Guide
Expand Your Brain with Evernote – Back to school Lifehacker blog post.