Hello, this is all explained in the HTML Fundamentals course, here in SoloLearn; https://www.sololearn.com/Course/HTML/?ref=app . Some of them are:
• href - specifies the URL (web address) for a link
• id - specifies a unique id for an element
• src - specifies the URL for an image
• style - specifies an inline CSS style for an element
• alt - specifies an alternative text to be used, if an image cannot be displayed
And many, many more. Go through the whole HTML course carefully, and don't rush. The learning process never ends.