Answer:
The difference is they are conjugated verbs with different pronouns.
Step-by-step explanation:
yo - como , el/ella - come, tu - comes
yo is -o which is used for yourself ( yo como pan)
el/ella is -e which is used when referring to she or he (el/ella come pan)
tu is -es which is used when saying you (tu comes pan)
ellos/ellas is -en ellas/ellos comen pan
I would say trying to find a chart of it online or making one yourself to keep whenever you forget.