THese tips are definitely helpful when modeling.  He takes the time to explain these with good simple explanations.

Beginner

He briefly explains the modifiers in 2.8.

Cool uses for several modifers.

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.

Cables are easy in 2.93 version of blender.

Inspiration

Beginner

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

Plugins that make Reptopolgy easier

Here is a list of most of the better add ons.  Notice decimate is the first one and is included with blender and simply reduces the amount of polys in the mesh. (Very useful)

Kit Bashing was first started by buying real model kits and making new things out of all the various parts.  Like having legos from a bunch of kits and making something new.

As Blender makes it's new asset manager system, Kit Bashing will become easier and more fun.  

Several plugins already have this functionality such as the kit ops plugin.  (very fun and fast to make for example sci fi props)

Beginner

The Blender Bros have cornered the market in how to do hard surface modeling.  It's easy to see why with great tips from them like the video below.  He has several rules that he uses that make sense when modeling.