[Ultra Sonic 007]

There are Wikipedia articles that give a thorough treatment to the subject (articles that appear to be well-sourced):

Examination of Apollo Moon photographs

3rd-party evidence for Apollo Moon landings

Regarding the 'C' on the rock, here's a brief treatment that is expanded on in my first link:

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8. The photos contain artifacts like the two seemingly matching 'C's on a rock and on the ground. These may be labeled studio props.

• The "C"-shaped objects are most likely printing imperfections and do not appear in the original film from the camera. It has been suggested that the "C" is a coiled hair.^[99][101]

Original AS16-107-17445 photograph 

Original AS16-107-17446 photograph 

Close-up of later generation prints of AS16-107-17446 

[rx]

...and that's why NASA felt the appropriateness to doctor the image, to remove the "coiled hair" without contemporaneously telling anyone about it? They clearly were inclined to do the fakery and executed the fakery, in bald contrast to what your youtube guy said was not possible.

Fail.

How many more times did they do things like this, yet haven't told us?

[rx]

How convenient to say the "coiled hair" didn't occur on the original, to which no one else would have access!

The enlargement below shows it could not have been a coiled hair, as the thickness of the C-tracing seems to vary through the curves, where a hair would not.

The preponderance of evidences does not favor NASA at all!

[rx]

Curiously, on the image where the "coiled hair" has been removed (right), the front-left lateral portion of the image has also been altered (The shadow there has become rectangular and certain other things have been smoothed or blended to be less prominent. An area near to the right of the C has also lost its shadow and apparently been smoothed partly away) If it had truly been merely a hair atop the print in post-processing, it does not follow that the image would undergo other transformations.