This tutorial talks about a scene done in cinema4d, but most of the ideas can be used in any 3d program.  

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I made this image by following this tutorial.

I used this tutorial here, 

Beginner

He briefly explains the modifiers in 2.8.

Cool uses for several modifers.

Constraints

Beginner

This person has some great ideas on how to use constraints to keep an object to a path, rig a piston, rig a jet exhaust,  He uses the snap to curser shift s keyboard shortcut.  He has some parts which don't constrain properly, and he shows you how to fix those issues.  

Beginner

Intermediate

This person from decoded has all the basics of making a room.  He explains how get the camera settings  from a thirdparty plugin, and how to make the room, furniture, and lighting.  If you do this tutorial you should be able to make a very nice room.

Beginner

This person describes the whole process he did to make a fantasy landscape.  He blocked out the shapes for his idea, and then added some elements like a picture of a hiker, some landscapes, and textures them, and then lights, and adjusted his camera.    He then goes over all the steps he did in photoshop which were straight forward.  I'm sure you could use gimp or something like that also.  Overall a very nice tutorial.  The addition of photoshop really makes the image much nicer.

Reference

When you start a project, always get reference first.  This will guide you through the process.  You can go back to an  image and ask yourself how do I make that, or I like this style, or that looks a certain way.  Without reference your guessing.  Don't. Real world video, real world items are used as reference to go beyond and make imaginary seem  Real.  How does granite or marble look like in real life?  How does a fruit look? Use google images, or bing, or youtube.  Some images can inspire also.

Where to get the Camera Shakify Addon

You can get the Camera Shakify add-on on Github . Click the green button, and click download zip. It is always good to check if there are newer versions and to read instructions.

This camera lets you get that Ian Hubart sytyle camera shaking easily.  I've tried to replicate his style by using the graph editor and using the noise modifer, but with out much success.  But this plugin really helped.

Inspiration

Beginner

Chong made a superb Tutorial in which he makes and animates a Sci Fi Corridor.  He models all the parts needed, (He uses a Boolean approach.)  An important tip is how he keeps the models to 1 meter, and sets the origin points to the lower right of the models so he can tile them later in geometry nodes.

Cables are easy in 2.93 version of blender.

Inspiration

Beginner

This is great.  Cables seem very easy now in blender. Oct 2021a