I want to learn guitar but where?

I didnt pay pretty much any attention on music at comprehensive school and now i only know like 3 or 4 chords, so im totally newbie at this. I cant afford for instructor giving private lessons irl but i can browse online 24/7, where can i learn or take lessons but only free ones. Every video on youtube has mistakes and such, according to the comments. I'd really much like to know how to read tabs But i dont know where to start, there are so many different techniques and stuff on it. I have electric(and amp) and acoustic guitar which i "try to" play. Should i start learning chords on acoustic and then trying to play some songs with them or does it affect the electric guitar style how to play, anyone got any tips where to start?