What holds a wall mounted TV up, why the wall type decides the fixings, and how the cables get hidden.
A wall mounted television is only as safe as the fixings behind it, and the fixings depend entirely on what the wall is made of. Getting that right is the whole job; the bracket is the easy part.
The wall decides everything
A solid brick or block wall takes the weight readily with the right plugs and screws.
A stud partition needs the bracket fixed into the timber studs, found with a detector, not into the plasterboard alone.
A dot and dab plasterboard wall, common on newer builds, has a gap behind it and needs specific fixings so the bracket pulls onto the brick, not the board.
Never hang a heavy TV on plasterboard plugs alone: it is the most common reason a mount comes off the wall.
The finish
Check for cables and pipes in the wall before drilling, with a detector.
Set the height so the screen centre is roughly at eye level from the sofa.
Cables can be run in trunking or, on a stud wall, dropped inside to a socket lower down.
TV wall mounting is listed under handyman on Halo Hive.