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Hi @1024son,

Please take a look at prior answer explains the difference between /opt/ros/.. and catkin_ws

To your question:

Can I confirm that after URDF is written with other parameters set (diff drive controller etc), I just have to create a package in "catkin_ws/src/launch" folder with a launch file launching the necessary packages (packages which is located "opt/ros/noetic/share")?

Yes. If you use catkin_make for example is a convenience tool for building code in a catkin workspace. Refer to the following documentation for more information why catkin was created and the different tools that can be used:

Catkin

REP-0128