I'm new and I want to make the enemy bounce

ello. I'm making a mobile game. How can I make the enemy bounce in the X direction when it reaches the sides or the ground? And considering this, how can I ensure that when it bounces, it doesn't exceed X height?

And while we're at it, how can I make them appear randomly from both sides of the screen?

I managed to do it by setting solid objects and making them bounce. What I’m not doing very well is getting the random enemies to appear correctly (although they are being produced), they don’t enter the screen properly despite forcing them to move towards the center. Some do, others go in random directions. Could it be because of the solid objects? The enemy is created in the top left and right, off-screen.

That would be reasonable. You can add the 'is on screen' condition to enable bounce only after they enter the viewport.

Or you can use the 'On collision' condition with the 'bounce off object' action along with the 'is on screen' condition as above, instead of just enabling bounce forever.