As the serial hobbyist I am, I've recently taken the plunge into 3D printing with the entry-level (but still excellent) Bambu Lab A1 Mini.
My early prints with the machine were hit or miss - always useable, but not always the quality I was expecting, and I was running into some inconsistencies even when printing the same model multiple times. With that in mind, I gradually did my research and came up with a number of settings to tweak in Bambu Studio to ensure consistent prints in as high quality as this printer is capable of. This is using a completely stock machine with the bundled 0.4mm nozzle.
Some words of advice...
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Make sure your filament is dry!! It doesn't matter what your print settings are, if you don't have dry filament you're going to run into quality issues. I live in a reasonably humid country and my printer lives in a room where we often dry laundry, so I certainly ran into filament issues early on. This led to prints with excessive stringing (light, wispy, spider-web like residue all over the print) as well as an overall rough texture. You can buy sealed filament storage tubs with space for a desiccant (this has been working really well for me) or, if you're feeling fancy, an actual powered filament dryer.*
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Finer settings mean longer print times. This is annoying at first as when you're in the exciting new-hobby honeymoon period you just want to get your prints out, but eventually when printing is more of a background to your life you reach a point where you'd rather guarantee good output, even if it takes longer.
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Quality only matters in certain scenarios. For me if a drawer insert or a hook is a bit rough it doesn't really bother me - I'll just go with the defaults and print fast. But if I'm printing something aesthetically pleasing or that I'll interact with frequently like a phone stand, a candle holder, a vase, I don't want it to immediately and obviously have that cheap 3D printed look. This is when I reach for higher quality settings.
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Different materials, applications and environments can benefit from different settings. I've used these exact settings with PLA, PLA+, PLA Matte and PLA Silk and been happy with the output. But of course they may not work well in every scenario, feel free to experiment yourself.
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If you've made sure your filament is dry and you're still seeing consistent print issues even with these high quality settings, make sure your printer is clean, well-maintained and run flow dynamics and flow rate calibration (both accessible via the Calibration tab in Bambu Studio).
My settings
Anything not mentioned below I typically leave at the default value, or whatever values the .3mf file brings with it.
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Project filaments Make sure to select your filament (or a close approximation) from the dropdown to ensure an appropriate filament profile is used.
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Quality preset This is the unlabelled dropdown which sits above the Quality/Speed/Strength/Support/Others tabs in the sidebar. For high quality printing I set this to "0.12mm Fine @BBL A1M". This automatically changes the print's line height, which is arguably the most important setting to change for a high quality print.
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Seam position Set this to "Nearest". I consistently see the best results with this option, resulting in a near-invisible seam.
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Outer wall speed Under Speed -> Outer Wall, I reduce this to 50mm/s. In the same section also ensure "Slow down for overhangs" is enabled, this is almost always on by default though.
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Line width This can be slightly reduced to 0.38mm
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Tree supports Enable these whenever necessary (i.e. if you have large, visible areas of unsupported overhang). It wastes a little filament, and it could introduce some roughness where the supports connect with your model, but in my experience this is minimal and it's much better than an unsupported print.
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Enable ironing This one is highly dependent as, in my experience, it only works on more or less completely flat surfaces. In this scenario though, nothing will give you a smoother finish. Enable it under Quality -> Ironing.
Happy printing, I hope this helped!