Our room is almost complete. You would have noticed that the door now is just a hole in the wall. To make it look like a door, we need to add a door frame and a door as follows:
When done, it should look like what is shown in the following screenshot.
I've used different views, such as top, side, and front, to adjust the frame nicely to fit the door. You can adjust Snap Sizes for some fine-tuning.
To help you move objects into position more accurately, you can make use of the snap grid button at the top of the viewport as shown in the following screenshot. Turning the drag snap grid on allows you to translate objects according to the grid size you select. Click on the mesh-like symbol to toggle snap grid on/off. The numbers displayed on the right are the minimum grid sizes by which an object will move when translated.
I have also noticed that a portion of the floor is not textured yet. Use the same wood texture as you did previously to make sure that the ground is fully textured using M_Wood_Floor_Walnut_Polished.
Then, click and drag SM_Door into the viewport. Rotate the door and fit it into the door frame in the same manner as shown previously. Here, you can see how the door is in place: