How to use shift registers and transistors in an led matrix

hello arduino community im 16 , im trying build 5x5 led matrix school project. ive read need use shift registers , transistors transistors draw current. understand multiplexing , im not sure if use shift register columns , shift register thransistors rows or vice versa. , have no idea how understand code. if explain code , how works better existing shift register threads , place shift registers , transistors appreciate it.

pleas help!!

maybe try bit more specific don't understand? there many threads, tutorials, instructables, .... explaining in varying levels of details.

what have read, , don't understand it?. ask concrete questions (and show you've done effort in trying understand it)
we won't making school assignments :p.

but maybe first answers: if plan make 5x5 matrix: don't need shift registers. need 10 pins control using multiplexing, no shift registers needed, arduino has more 10 pins.
and transistors: you'll split matrix in lines, , of single line when multiplexing leds can lit. normal led draws 20ma of current. arduino can handle @ 40ma. turning leds on @ same time draw 100ma, , risk damaging arduino.
to resolve this, put transistor between it. transistor electrically driven switch. provide small current, , can allow larger current flow. arduino may have provide 1ma, , open transistor 100ma can flow toward line of leds being lit.

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