A table of standard electrode potentials is like a big list that tells you how much different things like to give or take electrons. Think of electrons like tiny toys that different things want to play with. Some things really like to play with electrons and will try to take them from other things, while other things don't really care about electrons and will give them away easily.
The table puts all these things in order, from the ones that want to take electrons the most to the ones that want to give electrons away the most. This helps scientists predict what will happen when two different things come into contact with each other.
For example, if you put two things from the table together, and one is higher up on the list than the other, it means that the higher one will take electrons away from the lower one. This can cause a reaction, like a battery generating electricity. If the two things are next to each other on the table, it means they have a similar love for electrons, and they won't really do anything when they meet.
So the table of standard electrode potentials helps scientists understand how different things react with each other based on their love for electrons.