I keep seeing references to the Soultrap Glitch but can't find how to do it anywhere. Any help or directions please.

Lets you keep the effect of the Spell you make, it becomes permanent.

Buy the Spell or Spells you want to use.

Then go to a SpellMaker and Make:

Soul-Trap on Target for 2 sec.
Fortify Strength 25 points on Self for 2 Sec.

Buy the Spell, Cast it at Your Feet. Everytime you cast it your Strength will go up 25 points Permanently.

Just Substitute any spell in for the Fortify Strength Part.

Summoning (creature or bound on self 2 secs)

Many thanks Rohugh. I just tried it with a Summon Golden Saint but on the second summon it crashed. Can you only summon once?