Every explanation of electricity eventually reaches for water in pipes. We'll skip it, because the analogy breaks exactly where beginners get stuck. Instead: a circuit has charge that wants to move, a push that moves it, and things that resist the movement. That's the whole picture.
Voltage is a difference, not a thing
Voltage never exists at a single point. It is always a difference between two points, which is why a bird sits on a power line unharmed and why your multimeter has two probes. When a battery says 9V, it means the difference between its two terminals is nine volts. Nothing about one terminal alone means anything.
Current is a rate
Current is how much charge passes a point per second. It flows through things, never across them. This is why measuring current with a multimeter requires breaking the circuit and putting the meter in the path: the charge has to pass through the meter for the meter to count it.
Resistance ties them together
Resistance is how strongly a material pushes back against current. Ohm's law, V = I x R, is not really a law you apply so much as a relationship that is always true: fix any two of the three quantities and the third one is decided for you. Every lesson after this one leans on that single sentence.