It wasn't exactly a bad game for you; everything went downhill after you blundered the bishop. After you lost the bishop, you started attempting to defend everything. When your down material, you have to try your best to pressure your opponent into defending against your attack. If you stay offensive, you have a much better chance of regaining the lost material and probably more. Opening wise, I would say focus on the f and c pawns. What can you do with these pawns that adds pressure to the center? Maybe learn the queens gambit as white, its an easy opening to play and gives you great center control. Besides that, think about every piece you move and if you blunder anything on that move. Blunders are common at every level but the more you minimize them, the easier it will be to win.
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You played very well until you didn't. It's impossible to make a good suggestion without you telling what your decision process was just before the blunder: Did you calculate? or play on general principles? or just miss white's response?
After that blunder you'd really need to go for complications-here by opening the center even at some cost.
at least that's my view (and I often see players at your level make errors by not recognizing when they need to calculate). Bill
https://www.chess.com/analysis/game/live/111872038261?tab=analysis
Can someone do an analysis of this game, and some advice on how I should get better?