The question of heat shrink tubing.
Now, when it comes to building my circuits, I will be soldering together wires and there will be solder joints. How will I cover them up? Well, there are a lot of options here. One option is to use heat-shrink tubing. The main disadvantage that I see here is the possible complication in removing the heat shrink tubing. Another interesting option is cold-shrink tubing, which doesn’t require the application of heat for it to shrink. Perhaps it’s more convenient for installation, but it still has the same problems when it comes to removal.
20181117/https://en.wikipedia.org/wiki/Heat-shrink_tubing
20181123/https://en.wikipedia.org/wiki/Cold_shrink_tubing
Finally, perhaps my preferred and (personally) more traditional option for now it to use wrap-around tape tabs. I take a piece of tape, fold it over on two edges to create and easy removal tabs, and wrap the tape around the solder joint. This provides insulation at the solder joint, and removing it is as easy as pulling at the tape tabs. Plus, I don’t have to buy any new special materials to get started on this approach right away.