trample and blocked by ability rulings

[Smash]

what are the trample and blocked by ability rulings in magic

[Gezhe]

If a creature that has trample is blocked by another creature(s), anything past lethal damage is dealt to the player

so like if I have a creature with 5 power which you block with creatures with 4 toughness, those blocking creatures will die and in addition you take 1 damage yourself

702.17. Trample
702.17a Trample is a static ability that modifies the rules for assigning an attacking creature’s
combat damage. The ability has no effect when a creature with trample is blocking or is dealing
noncombat damage. (See rule 510, “Combat Damage Step.”)
702.17b The controller of an attacking creature with trample first assigns damage to the creature(s)
blocking it. Once all those blocking creatures are assigned lethal damage, any remaining
damage is assigned as its controller chooses among those blocking creatures and the player or
planeswalker the creature is attacking. When checking for assigned lethal damage, take into
account damage already marked on the creature and damage from other creatures that’s being
assigned during the same combat damage step, but not any abilities or effects that might change
the amount of damage that’s actually dealt. The attacking creature’s controller need not assign
lethal damage to all those blocking creatures but in that case can’t assign any damage to the
player or planeswalker it’s attacking.
Example: A 2/2 creature with an ability that enables it to block multiple attackers blocks
two attackers: a 1/1 with no abilities a 3/3 with trample. The active player could assign
1 damage from the first attacker and 1 damage from the second to the blocking creature,
and 2 damage to the defending player from the creature with trample.
Example: A 6/6 green creature with trample is blocked by a 2/2 creature with protection
from green. The attacking creature’s controller must assign at least 2 damage to the
blocker, even though that damage will be prevented by the blocker’s protection ability.
The attacking creature’s controller can divide the rest of the damage as he or she
chooses between the blocking creature and the defending player.
702.17c If an attacking creature with trample is blocked, but there are no creatures blocking it when
damage is assigned, all its damage is assigned to the player or planeswalker it’s attacking.
702.17d If a creature with trample is attacking a planeswalker, none of its combat damage can be
assigned to the defending player, even if that planeswalker has been removed from combat or
the damage the attacking creature could assign to that planeswalker exceeds its loyalty.
702.17e Multiple instances of trample on the same creature are redundant.