Hitches, knots, line, chafing gear, cleats on docks, ring bolts, chain, shackles, swivels anchors vs sand screws
When securing lines it is not only a case of securing but also a case of being able to unsecure and re adjust the line.
When securing to a sampson post, bollard, or a winch, Do NOT use a clove hitch. Once a clove hitch is heavily loaded the only way it can be unsecured is with a good sharp knife.
Use a tow boat hitch, to the Americans, lightermans hitch to the English, as this hitch can be unloaded under heavy strain and line veered.
Lines that are on heavy load may have to be moved. Learn to reliably tie a line to the loaded line with a rolling hitch so that the load can be taken on the line secured by a rolling hitch and the loaded line moved to a better tie off point