For prototyping work, especially when wiring components inserted in a solderless breadboard, I use a spool of tinned copper wire, 24 AWG, that is inserted into cut-to-length pieces from a spool of Teflon tubing, sized for a sliding fit over the wire. These two items, a spool of wire and spool of tubing, were acquired many years ago at a local surplus electronics store (Mendelson's) where everything was originally sold by weight. I got a very good price for the wire and the tubing, so I purchased a "life time" supply.
By using bare, tinned, wire with a separately applied insulating sleeve, it is very easy to construct point-to-point wiring. You unspool some of the wire, estimating the length of wire you will need, and either solder the end of the wire to the first attachment point or insert it into the breadboard contact. Route the wire to the second attachment point, bending if necessary. Finally, you cut the bare wire from the spool, leaving an inch or two of excess, or less if you have acquired some experience. Then you eyeball the length of tubing you need to cover the wire between the two points of attachment, cut that length from the roll of tubing, slide the cut piece over the wire, and either solder the free end of the wire to the second point of attachment or insert it into the breadboard contact.
Having the wire and the insulation as separate pieces avoids the necessity of stripping the wire on each end and possibly nicking the wire. A nicked wire will soon break at the nick, even if you solder over the damaged area. Teflon insulating tubing may seem like a luxury... and it is. Were it not for the fact that I acquired a large spool of it several decades ago, I would be using another form of insulation over my bare, tinned, 24 AWG copper buss wire.
Somewhere in my pile of junque I had a roll of tubular green fabric insulation, sized IIRC for 20 AWG. I often used this until acquiring the Teflon. It was just the right size to fit over one-watt carbon composition resistor leads, and "back in the day" when we built circuits on bakelite boards with swaged terminal posts to hold components, it was perfect for that task. I also discovered that I could strip the insulation from some types of stranded wire, up to about a foot or so of insulation, and use that to cover 24 AWG solid tinned copper wire. Sometimes Teflon insulated wire was available, but it required a sharp single-edge razor blade to cut the insulation from the underlying wire. This was how I found out that Teflon tubing was very good insulation, but it was years later that I found it for sale at Mendelson's, way back in their "wire" department on the third floor. BTW, riding that creaky old freight elevator up and down to the third floor was all part of the ambiance and experience of visiting Mendelson's on a rainy Saturday morning.
@Audioguru mentioned that he never uses bare copper wire that has turned green with corrosion. Good advice that, but sometimes lengths of four-conductor telephone cable "became available" with red, green, black, and yellow insulation over bare copper wire. You had to separate out individual conductors, cut them to the required length, then strip and tin the ends to make your prototype connections. Freshly stripped ends on insulated solid bare copper wire will generally tin well with a quality rosin flux-core 60/40 solder and a clean soldering iron at the proper temperature. I have a one pound spool (lifetime supply) of Kester Alloy Sn63Pb37 that has a Flux "44" Rosin Core in a 0.040" diameter solder shell, manufactured 16 July 1992. This is a eutectic alloy that melts and solidifies at a specific temperature without going through a "plastic" and granular phase transition. Highly recommended over any other solder, especially for beginners just learning how to make good solder joints.
Avoid ANY solder claiming to be "lead free" unless you really know what you are doing. Plumbers joining copper pipe for potable water use, and amateur radio enthusiasts, use lead-free solder. Hams sometimes use a solder with silver in the alloy to improve the conductivity of copper carrying large radio-frequency currents. I don't have any experience with this yet, but I am building a hexagonal-shaped copper-loop antenna and will be going back over the joints with a silver-based alloy solder. Radio frequencies are conducted only near the surface because of "skin effect," so I need to make sure the surface of the joints is at least as conductive as the bare copper pipe. I could also silver-plate the copper pipe, but that would be rather expensive and may not be necessary if the antenna works "as is." It pays not to overthink things like this before actual field trials.