Teleport player to the Nether safely

I am also new here. I will try and create something similar and get back to you.

Hello. I have an idea. What if, you found the coordinates of a structure or feature like a fortress, and teleport to that. I haven't tried it yet though.

Hi, I have an idea for you. Maybe first turn the blocks in a 5x5x5 cube around you into air, then into a hollow glass cage. When you teleport, immediately set the y coordinate of the player to something higher than the sea level for lava in the nether so you dont have to worry about that.

What if they have silk touch and use it for farming glass? I would say make a new block that cannot be obtained, but can be broken.

The chorus fruit teleportation never teleports you inside a block.

Building off its algorithm, I'd suggest something like:

1. Check random points in an increasingly large cube around where your target location is.
2. For each one, make sure the block and the block above it both have air.

For the first one, I would probably do something like this:

float size = 1;
int x = 0;
int y = 0;
int z = 0;
while (true) {
    x = Math.floor(Math.random() * size * 2) - size;
    y = Math.floor(Math.random() * size * 2) - size;
    z = Math.floor(Math.random() * size * 2) - size;
    if (validPositionBySomeMeasure(x, y, z)) {
        break;
    }
    size += 0.4;
}

I would also recommend putting some sort of limit on the while loop.