yes, true and accurate.

Most important is around the suspension pickup points, but anyplace stress is focused in the chassis can benefit. keep in mind what the chassis is and what is non-structural, it's easy to get carried away and waste your time, or worse weld something that can be removed.

be careful a lot of modern cars use adhesives in the seams to act as pseudo welding, which can stink, make it hard to weld, and make you ill in large doses.

all in all a good thing if you have an old tired chassis.

here you go

Four Star Motorsports: Body Seam Welding

British Motor Heritage's 1964 FIA-spec MGB Race Car

Honda Integra Type R Dc5 Engine Bay Welds Photo