No idea what im doing

Hi I'm new to all this and need to know is it okay to solder my black and red power wires coming out of my ESC straight to the wires that are on the cable that has the bit I plug into my battery or is it absolutely vital I solder it to a battery connector first ( deans connector )? Asking because I don't have a connector on hand and just wandering if I could save some time waiting for one to come in post .

Hi guys gals I just got my first RC car the being the vantage 2.0 and already managed to **** it the motor seems to be done then lost all control of steering . So instead of fixing what I have I just want to upgrade the whole thing tbh to I think what people say is better a brushless motor and need some help finding the best place to look and from my research I need different parts with the different number of teeth on them I honestly don't no any of the lingo surrounding RC if someone could reply with links or something would be much appreciated