Indenting a paragraph

I’m brand new learning to code. When copying a paragraph to indent. The tab or space bar does not work to indent. The tab erases the entire paragraph/code instead of indenting it. I don’t have this problem outside of these lessons. Can someone please help me resolve this issue?

indenting is just adding some spaces at the beginning of the line, some editors may have some shortcuts, but they don’t do anything more
also if you put the cursor at the beginning of a line you can indent with the tab too