Basic Summoning Mechanics:
Normal and Effect Monsters with a Star Rating of 4 or lower can be played from the hand to the field, known as Normal summoning. you can only normal summon once per turn
Normal and Effect Monsters higher than 4 Stars require other monsters on your side of the field in ordered to be played by tributing 1 or more monsters currently on your side of the field (5-6 Stars require 1, 7 Stars+ requires 2)
Effect Monsters that are played facedown in defense position are "Flip Summoned" by being attacked or manually flipped by the player on the next turn activating their Flip effects
yeah so special summoning is really loose now and many many cards let you special summon from anywhere to anywhere, sometimes ingoring explicit summoning conditions
ok now that we've defined the base summoning mechanics, lets get more advanced :3