Gitzo are the best but assuming you want something cost effective, I would choose something like this, but I'm no expert. https://www.ebay.co.uk/itm/Neewer-Carbon-Fiber-66-168cm-Portable-Camera-Tripod-Monopod-with-360-Ball-Head/202285847308?_trkparms=aid=555017&algo=PL.CASSINI&ao=1&asc=20151005190540&meid=4853788b824a4d51a7e94004311f06d5&pid=100505&rk=1&rkt=1&&itm=202285847308&_trksid=p2045573.c100505.m3226 lots of helpful advice on photography here https://strobist.blogspot.com/2014/09/choosing-tripod.html
Bear in mind that lighter tripods will be more easily affected by wind etc which will introduce movement, which kind of defeats the point of them. It's a balance.
This one can take up to 3 kg, so I guess yes?
I have d600 and prime lenses. Makes it very heavy. What do you suggest?
Can this handle a full frame camera with a heavy lens? I used 20mm sigma art lens with d600 on my current stand and it keeps pointing down.