After writing a html code what is the process

Answer 1

After writing your html code :
✓ Save it using .html or .htm extension
✓ Then after saving, open the web page in a web browser and you can check the output there

Also include relevant tags so that you can get effective and fast answers.

Answer 2

Adding to what Nova said, browsers understand HTML code, so you need not to compile the code. Direct run your file in browser.