Highlighted squares

My apologies if this was asked, but what do the red and green highlighted squares signify?

Here's another one:

Hi, @mullerrj , these are new features of the Move Assistant.
See https://siderite.dev/blog/lichess-tools---user-manual/#moveAssistant

Thanks TotalNoob69. I just want to see if I got this correct. Let's start with the pawns on the board directly above. I'm playing the black pieces. I'm guessing the reason my g-file pawn is highlighted red is because although it's a 'passed pawn' it's still considered an 'isolated' pawn thus, the red highlighting. Same with white's 'passed pawn' on the f-file. Even though, technically, the white b-file pawn is really the only true 'isolated' pawn.

Now, let's go on to the green highlighted squares h2 and f2. I'm guessing since I'm playing the black pieces that that is the so-called 'orientation side', so the green highlighted squares are weak squares for my opponent (white). Therefore, they're good squares (like and outpost square) for me. Likewise, the red highlighted squares are strong squares for my opponent (white) and weak squares for me (black).

I'm not sure why the a5 square is considered a weak square for black. Is that because, in the current position, if black were to make the move Ra5, white could make the move Bd8+ and skewer the rook on it's next move?

Thanks for your Lichess Tools. I really love them. In fact, it's the primary reason why I use Lichess daily. Rob

Everything you said is correct, @mullerrj, except for the a5 square, which is highlighted as a weak square since no pawns can defend it. And yes, an outpost on the rim is pretty dim, but still counts.