Hi Chatnoire, and welcome.
Shimano (and SRAM, and Campagnolo sp?) have different levels of cost and quality for their group sets. (A group set, or grupo sp? is a set of components that are supposed to be designed to work well together, so, probably brake levers, crank, cassettes, chain, and maybe something I'm not thinking of? My bike has Shimano ultegra and 105, so I guess they can be mixed to some degree.)
I'm guessing the 11-28 is the rear cassette. On the littlest cog, there are 11 teath, and on the biggest, 28 teeth. More teeth in back means easier to pedal. (On the front, more teeth means harder to pedal). My understanding is that 11-28 is a good all around choice because the 28 makes it easy to pedal, and the 11 is good for when you're going faster. So you have a wide range of choices. (Your front cassette either has one ring, two rings, or three rings.)
The more expensive the group set, the lighter weight, and better quality it's supposed to be. If I recall, 105 is about the middle or lower middle of the line for Shimano. It should work well for most regular folks biking.
Cervelo vs Synapse in mountains? I think Cervelo is a company that makes several different sorts of bikes, and Synapse is the name of one of the bikes made by, umm, Cannondale?
Depending on your biking needs and desires, different bikes will work for whatever mountains you're riding. If you're like me (middle aged and not very serious), a less aggressive road geometry is comfortable and makes me smile. Were I more fit and flexible, then a more aggressive geometry might make me smile. The bike for you is the one you can afford that makes you smile. Try lots, and see which makes you smile.
Wool in summer. Sure. Wool tends not to smell in quite the ways that some synthetic clothes do, and the right wool can be comfortable in warm weather. It's a pretty cool material, too (in technical terms).
Base layers: for cold, for sure. But surprisingly, I've read that wearing a special base layer that wicks sweat away (so that it can cool you by evaporation) is a great thing in really hot weather. I know when I watch hot races, a lot of the pros are wearing a light looking underlayer under their team jersey.





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