Often times at first glance a board looks straight and the fact that it is actually bowed or has some warping isn’t always obvious. So the trick to knowing for sure, is to hold the board up towards your face, with the other end on the ground, and look at it at a downward angle (as shown in the below photo). This method will allow you to see if it is bowing at all.
It might not be the easiest project in this list, but if you already have some experience with wood cutting and joinery, it won’t be any hassle at all. Thanks to the extremely detailed instructions it shouldn’t really be a problem even if you’re not very familiar with woodworking. This could actually be a great project for refining your woodworking skills as a beginner!
This plan is probably the easiest plan ever added in the list. The one who is working on this project, don’t need any professional skills but just knowing some basics of woodworking will be enough for this DIY. You will get step by step detailed process of this tutorial in the source linked tutorial. This tutorial will surely help you to build this plan quickly.