Pawns on opposite or same square as bishop?

I watched two youtube videos and they both say contradicting things:

one says, put your pawns at the same color square as your opponents bishop ‘to take away spaces’ from the bishop

the other says, put your pawns on opposite square to their bishop to avoid them ‘from becoming targets.’

Which is it? I need to know. Does it change if you have minor pieces? HELP?

Chess isn't so simple that the same strategy works in every position. Those are both reasonable ideas depending on the position.

Of the two, putting pawns on the same color as part of a restriction strategy is more double edged. If the restriction fails the pawns might become weak, if it succeeds you might get an advantage.

In my experience the restriction idea is more common in endgame (or at least queenless  middlegame) positions. For the first half of the game or so it's probably more useful to think about whether or not your pawns are allowing your pieces to be mobile and active.

Putting the pawns on your opponent bishop colours work well in the middlegame for restrictions but in the endgame the pawns become targets for the enemy.

Are you on offense or defense?

For example, in an OCB ending, let's say you have the following:

White has a dark-squared Bishop and 6 pawns.

Black has a light-squared Bishop and 4 pawns, none of those 4 are passed or constitute a majority 

Clearly, White is looking to win, Black is looming to draw.

If the Black King can block the White King from entering the back of his pawn chains, he wants his pawns on light squares to create a fortress.

White, meanwhile; is trying to win up the 2 pawns.  He wants to put his pawns on light squares to impede the Black Bishop.  White can use his Bishop to control the dark squares.  If White's pawns all end up on dark squares, the Black LSB would be able to build a blockade and your pawns become immobile.  So they need to reside on squares the same color as his opponent's Bishop, and use the Bishop and King to get past the dark square.  So a White pawn, in 2 turns, can get his f4-pawn to f6 by controlling f5 and walking the pawn thru f5 to f6.  Then do the same to get the e-pawn from e5 to e7, etc.

So putting them on the color of your Bishop or his depends on your current situation.  

In the opening/middlegame just make sure your pawns don't block out your own bishops/other pieces. In the endgame it's probably better to have them on the opposite color square as the bishop as to not be attacked.

In a mid game, you should mostly block his bishop, rendering it useless.

In an endgame, you may like to remove all your pieces from his “bishop color”, rendering it almost obsolete.

The general rule is to put your pawns on the other color of your bishop then you have a good bishop not on the color of your pawns. Your pawns do not hinder your bishop. Your pawns control squares of one color, your bishop squares of the other color.
However if you are defending then it is often better to put your pawns on the same color as your bishop.
"Bad bishops protect good pawns"

Part in red:

While it's true that sometimes pieces are valuable because they defend something important, as a general strategy, it's basically never good to put pawns on the same color as the bishop. One of the only common exceptions is if you're making a fortress in an opposite color bishop endgame.

It's actually a common mistake for inexperienced players to put pawns on the same color thinking this is "defensive" when in fact it's often just losing.

A fun example, either side to move, white is winning:

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Even when you're on the defensive, for example let's say you're defending a bishop vs rook endgame, all the best fortress ideas involve having pawns on the opposite color as the bishop.