@spleevy part of it is using the straight edges technique, but I also use a ruler to check if my knots are in alignment by making sure each end is still at 90 degrees and adjust if necessary every row! I hope this helps you!
@fdenton05 Handmadelenin on YouTube has a video in which she explains how to make a bookmark hole and there are also videos by other people who explain how to make tassels. If you search for "friendship bracelet bookmarks" you should find the videos.
