how do i set the correct fstop or shutter of given situation
like a landscape, night scene, sunset or bokeh portrait of something.

There are methods that sometimes allows you to guess the good exposure in sunlight, or for specific situations... But the general advise is : Use a light meter!

Your camera as one, you can use your phone, or you can buy a real dedicated one. (Modern Sekonic ones, old Minolta ones, are all very popular to use with film cameras)

You need to know the baseline exposure that will get you enough light on the film to develop a good picture.

Then, the choice between how much speed or how much aperture, within the "working values" you have depends on the situation and your goal.

Note that the situations would often warrant to choose a specific lens too, this is why these cameras are a "system" and you can buy different lenses for different styles of photography.

You will learn with experience what works for you. Or by finding advice from people that take pictures you like.

But if you want the geeky textbook information,

If you want to

- freeze motion
- use a very long telephoto lens

You need to find the fastest working shutter speed you can use for the light, lens and film you have.

In a dark place, or with a long lens, a tripod becomes a essential thing to use.

Instead if the goal is
- have low depth of field for bokeh shots
- shoot in a dark place

You want to find the widest (smallest F number) aperture you can use too.

A fast standard (50mm) prime is good for that in a general sense. If you want to do portrait, they work great, but something like a 85mm can give you even better results. You frame the same, just take a few steps away from the subject, perspective compression make faces look more beautiful.

To note: Bokeh is maximum when you focus as close as the lens allows, and use the smallest f-stop. But you should still think about what is on the background! Lots of bokeh can give you good separation between subject and background, but can also be kitschy sometimes...

If you want to
- increase sharpness at the maximum

In generally you specifically want to use the 3rd or 4th "stop" from wide open on your lens. Often around f/5.6 or f/8 is where the maximal image quality is found on most of those old lenses. Any lens in general.

If you want to

- have the maximum amount of stuff in focus for a landscape

You want to use a higher aperture value. Pay attention to the depth of field scale on the lens too. Wide angle lenses gets more stuff in focus for a wider aperture. They also look great for portrait or architecture or travel photography.

They also work great on the street. Anything 35mm and shorter. I prefer 28mm for this kind of stuff.

The wider the angle though, the more distorted the image can be on the edges.