end of the world????

When we are now entered in the 2nd Grading Period, The
learnings/discoveries that I have learned in the ICT IV is all about HTML or it is known as,"Hypertext Mark-up Language". Using HTML I learned about the tags, the kinds of tags and on how to start HTML File on the Notepad Application.
On this topic, HTML, we encountered different challenges and problems. And what are these? The first one is when I saved my activity or Exer1, I noticed that instead the internet explorer will appear is the notepad is appeared. And when i've done again making my 2nd activity or Exer2 when I save that I thought it's already ok but when I open it there were no something appear?it is blank or empty.
So I addressed my exer2 by asking our teacher Mrs. Vera Cruz why my Exer2 can be open but it is empty. And she said that I will check first the file name that i've save because maybe I missed a punctuation mark or maybe my spaces. And I addressed also my exer1 by deleting it because I cannot open it then I retyped again and I saved it. After that it's now ok. I can open it already.
Moving on I will check better my spaces and punctuation marks and by saving a file name of our any activities so that i can no longer encountered problems.