lower control arm - help me

i need some advice.. i dun know much abt car parts.. coz i'm a chick that doesnt get too technical..

i recently crashed my car and had some wheel problems.. one mechanic said to change the "knuckle" and some "tie rod" then get a wheel allignment..

then i changed my lower control arm.. can some1 advise me of whether i'd still had 2 change the other two parts mentioned above?

i'm just stressing over this.. and i'm jus not understanding what i have to do from here..

which wheel/wheels exactly were affected?

the front doesnt use control arms. it could be the knuckle/tie rod but this should be visible to the eye.
The rear uses cotrol arms/trailing arms to control camber/caster/toe in, out

its just the front left.... well the lower control arm has been changed already...