I started using blender couple of days ago but i think i have come a long way. I finished my first project. I did all the coloring, camera angels etc. When i finished my project i rendered it. But when it comes to saving, saving options not working. I can only save it as a .blender. I cant change it to jpeg or png. When i save it as a .blender and i open it up i cant see the image i rendered. I can only see the tiles like pictures u can see in microsoft excel. When rendering ends i pressed f3 to save it but i can only save it as a .blender and cant change it to any other form. I downloaded the Blender couple of days ago i think its the latest version. How can i solve this issue. TLDR: I cant save the finished project as i wanted to be.
When you save as .blend, you're saving the project, not the rendered image.
When you finish a render an image editor window pops up, showing the rendered image; in this window go to the image menu and choose save as, then you will choose if PNG, jpg, EXR, ...
Shortcut is Alt S.