The fabric attachment system is low-tech, but that seems to be helpful, as it can adapt to seat rails of different widths. One fancier option you might see on more expensive seat bags is a quick-release mount that you install under your saddle. But those have a fixed width, and therefore can fit under seats with only those exact specs. Brooks saddles, for example, are too wide for these mounts.

That’s a reality of all hand pumps—it’s really hard to get a tire up to pressure with these things. So another reason Lezyne pumps are so good is because you can actually keep pumping longer than any other brand we tested. With excruciating effort, we could get the Sport Drive HP to pump tires to 90 or 100 psi. It still wasn’t easy, but it wasn’t impossible the way it was with some other models.
A bicycle costs anywhere from $250-$9,000 depending what type and quality of bike you want. A utility bike from a department store might cost $300-$500, but experts caution that it will be quite a bit heavier and not as well constructed as other bikes. For a durable, lightweight bike with front-suspension and decent parts, it’s reasonable to pay $750-$1,200. You might be able to pay slightly less, but expect to need some repairs after several months of heavy use.
If you’re going to use the chain whip you just made, you’ll also need a way to get that cassette off. A lockring remover is a must-have; unless you use one of the shady removal methods I’ve seen on the internet—which I wouldn’t necessarily recommend unless you don’t care much about the condition of the wheel after you use them. I recommend Park Tool’s iterations here that cost about $6, but you’ll need to buy the specific one for your brand/type of cassette. (By the way, I’m assuming you already have an adjustable wrench laying around somewhere to use with this tool. If you don’t, well, you’ll need one of those too.)
Mountain bikers are in different world of repair entirely, one that borders on the comedic absurd. It includes large pumps designed to fill up big, fat tires that squish over things, and a medley of assorted slimes meant to be injected into tubes or tires. In that world, the number of days it takes you to fix your tire and return from the wilderness is a badge of courage—bonus points if you’re bleeding—and we’re guessing that’s not what you’re going for next time you set out for groceries.
It is a good solid stand made mostly from heavy metal, but it does have a couple of problems. (I will use part names from the instructions to explain.) First, the clamp between the "telescopic bar" and the "upright" is plastic. It arrived broken in the box. Whoever boxed it should understand that if you put it in the box broken, the customer will remove it from the box broken. I did not return it as broken because I was able to Gorilla Glue it back together and it works fine; it clamps tight enough to hold the telescopic bar in place. Second, the "bike support stand" (the horizontal bar at the top that holds the bike), when attached to the seat support does not grip tight enough to hold the bike in the position I set because there is too much weight from the front of the bike. The torque causes the bike to rotate until the front wheel is on the ground. That is not enough for me to return the stand because I seldom work on the front wheel and if I do I can attach the stand to the top horizontal of the bike frame. I think they could fix the problem by not making the "bike support stand" so smooth, give that part a sandpaper like finish or put rubber fingers inside the clamp so the part does not slip under the torque from the weight of the front of the bike. I might rough up the stand part with sandpaper, or put small grooves in it to give the clamp something to grip on to see if that solves the problem. Third, the clamp holding the bike frame even at full tight will not keep the bike from rotating around the frame. It is not enough for me to send the stand back, just a minor annoyance. The problem is there is smooth plastic trying to clamp a smooth metal frame. I think they could fix this by putting thin rubber pads in the clamp. I will probably run out and get some pads to try that out. I think it is a good stand for the price. The stand itself is made from much heavier metal than I expected. It is very stable with the four legs. I easily overcame all the issues so I kept it.
Main types of bicycles are road, mountain, commuter/comfort and fitness bikes. There are more specific types and other names for bike types within that, such as urban bikes (same as commuter bikes), cruiser bikes, dual-sport bikes, hybrid bikes, fixed-gear bikes, cyclo-cross bikes, adventure road bikes (aka  all-road bikes, gravel bikes), road bikes, touring bikes and specialty bikes, like BMX.

Change and a $20 bill:   In case your cell phone’s battery dies, it’s nice to still be able to use a payphone if you need to.   Also, the $20 is a great thing to have in case you lose your wallet or have some other mishap.   I’d rather be able to sit in a coffee shop or fast food restaurant when it starts raining while I’m waiting for my friend or cab ride, and a hot cup of tea or coffee or the beverage of your choice and a snack makes it all the more pleasant.  Just try to remember, this is for emergencies, and if you use it, replace it ASAP!
These are some great ideas, especially the simple ones like bringing a garbage bag. That’s something so easy and cheap that it’s easy to forget entirely, but as you say, it can make a huge difference in the right circumstances. It’s also good that you discuss some minor bike repairs. That’s another thing that can salvage or destroy your ride. You want to be as prepared as possible for the best possible experience.
Friction gear systems are a lot simpler to adjust, because the movement of the derailer cable can be modulated as you ride, every time you change the gear- they require less cycle maintenance. Modern index shifting systems are a little more complicated because each ‘click’ must release the exact right amount of cable to allow the derailer to move the correct distance to move the chain from one gear to another. Setting up and adjusting a derailer is not difficult and requires only basic tools, but there is a methodical procedure to follow.