Step 1: Go to the Steam game library;
Step 2: Select Dota 2;
Step 3: Right-click on the game and select "Properties";
Step 4: In the General menu, find "Startup Options";
Step 5: Enter the commands you need in this line.

-console - Launches Dota 2 with the console turned on.
-fullscreen - The game runs in full screen.
-windowed - The game starts in a window.
-noborder - The game runs in a frameless window.
-autoconfig - Resets graphics settings to default.

-novid - Allows you to skip the Valve opening splash screen when starting the game.
-high - The game starts with high priority.
-nod3d9ex - Disables DirectX Windows Aero, which makes the game quickly minimize and may also improve performance.
-dx9 - Runs the game in DX9 mode.
-dx11 - Runs the game in DX11 mode.
-vulkan - Runs the game in Vulkan mode.
-gl - Runs the game in OpenGl mode.
-map dota - Loads the Dota map before the match, which will allow you to quickly move on to the draft stage after searching for a game.
-prewarm - Loads resources for the game before the main menu appears, which allows you to start the match faster.
-noaafonts - Disables font smoothing.
+map_enable_background_maps 0 - Completely removes effects from the main menu.
-novr - Disable VR mode in the game.
-nojoy - Disable the joystick/controller in the game.

You can use all the following commands into the Text Chat activated by the "Enter" button!

-lvlup # (where "#" number from 1 to 30) - Increases the hero's level.
-gold # (where "#" number up to 99999) - Gives you gold.
-respawn - Resurrects the hero.
-refresh - Removes cooldowns and gives full mana/full health.
-spawncreeps - Creates creeps.
-spawnneutrals - Creates neutral creeps.
-ping - Shows the current ping (You can also use this command in a common game).
-teleport - Teleports you to any point on the map (You need to show the point for teleportation with the cursor and then write this command in the chat).

Also you can find other commands here[dota2.fandom.com].