What are the ways to start editing a file in the Vim editor?

In Vim, to start editing a file, you need to switch from command mode to insert mode. Main ways:

• Press i — insert before the cursor.
• Press I — insert at the beginning of the current line.
• Press a — insert after the cursor.
• Press A — insert at the end of the current line.
• Press o — open a new line below and switch to insert mode.
• Press O — open a new line above and switch to insert mode.

After that, you can type text. To exit insert mode and return to command mode, press Esc.