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I have done very good work with a vintage Pentax Spotmatic, it is a nice simple reliable manual camera on which it is easy to learn the fundamentals of photography. Both the body and the lenses are inexpensive, in the USA US$50-100 buys a body and a very good standard Pentax 50mm lens. There are a gazillion used lenses (M42 mount) out there that fit the body, at all price points and quality. Use the "sunny 16 rule" for exposure estimation. You can't go wrong.
PS the attitude that electronic shutters are unreliable is not supported by the experiences of millions of photographers. Yes they can fail but so can mechanical shutters, much depends on the quality of the parts used to make the shutter, which often is related to cost.
The Pentax Spotmatics are a bargain because by modern standards they are obsolete and unwanted, not because they were cheap to begin with, they were well made.