Begin with what you are working with. Note the television's size and weight from its manual, and establish what the wall is built from — timber studs behind plasterboard, solid masonry, or a hollow partition. The substrate decides which fixings are appropriate and whether the wall can carry a cantilevered load at all. If the construction is unclear, or the wall is a non-standard build-up, treat that as a signal to seek qualified advice before drilling.
Do not assume a wall can hold a TV. Unknown or damaged wall construction should be assessed by a professional.