how to load individual component footprints of 1 to 2 devices from kicad 5 and load them in pcbnew for placing and routing them in kicad 5
Do you mean that you have a complete schematic with more components, but you want to place only few of them at a time to the layout? I don’t think KiCad supports that, and I don’t understand why that should be done. You can read the whole netlist and put all components to the board, then place and route those you want, leaving the rest aside for a moment.
Might be a bit backwards as the most important thing for a good layout is to arrange the components such as to avoid too many crossings and have the things near each other that must be near each other. (It typically takes me twice as long to find a component placement than to do the final routing.)
Leaving parts aside will mean you later need to fit them in between already existing stuff. -> Will most likely break the part that is already done and therefore require much more rework than necessary. (Exception: Your system is comprised of completely separate modules that do not have much in common AND you have the space to keep them well separated.)
I have a netlist of almost 21 components is there an easy or effective way to place the footprints effectively without causing more DRC error. Is their approaches which enable us to place all components manually without much DRC error how to route them.
how to spread all foot print of all components after loading the net list and place them
how to spread all footprint of all components after loading the netlist and place them in kicad 5.1.2
This should happen already in 5.1.x (Both the update pcb from schematic tool and the netlist import spread out footprints on import. The footprints are even grouped together by hierarchical sheet.)
Or did i misunderstand your question?
No, you are on the correct track
So does the update from schematic tool spread out footprints or is there still a problem?
I am not able to spread out the footprints hi I am getting these errors can you please help me what has to be done to fix these errors
ErrType(53): Track too close to board edge
@(129.540 mm, 69.450 mm): Via 0.800 mm [] on F.Cu - B.Cu
i have PCB designed at a size 6842mm i want to reduce my pcb into a size 5030mm currently i have place components in 1 side I have just tried 1st time new to pcb can you please guide on how to place components on both sides and how to route
I mean current size is 6842mm we want to reduce it to 5030mm
First check if your manufacturing processes even allow for that. (Reflow soldering with parts on both sides will be much more expensive.)
As far as KiCad is concerned getting components to the bottom side is done by use of the flip functionality (hotkey F by default)
You might also want to ask experienced colleagues of yours for guidance as we can not provide much with the information given. (Minimum required for any help is a screenshot of the current state of the pcb.)
Also we are volunteers focusing on helping you with usage questions about KiCad. We might be willing to give pcb design advice but there are for sure better forums available for that. (eevblog and stackexchange come to mind as well as pcb design subreddits. Check also if there is a general electronics design forum available in your native language to reduce problems arising from language barriers.)
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You work fast! 
Dale
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