how to set PATH, LD_LIBRARY_PATH, PYTHONPATH

#export PYTHONPATH=/home/ninja/workspace/caffe/python
export PYTHONPATH=/home/ninja/workspace/caffe3/python

#export PATH=/home/ninja/anaconda3/condabin:/home/ninja/bin:/home/ninja/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/ninja/anaconda/bin:/usr/local/include/opencv2:/usr/local/cuda-10.0/bin
export PATH=/home/ninja/bin:/home/ninja/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/usr/local/include/opencv2:/usr/local/cuda-10.0/bin
#PATH=$PATH:$HOME/anaconda/bin:/usr/local/cuda/bin:/usr/local/include/opencv2
#PATH=$PATH:$HOME/anaconda/bin:/usr/local/cuda/bin # 10.0
#PATH=$PATH:$HOME/anaconda/bin:/usr/local/cuda-9.0/bin
#PATH=$PATH:$HOME/anaconda/bin:/usr/local/cuda-8.0/bin

export LD_LIBRARY_PATH=/usr/local/lib:/usr/lib/x86_64-linux-gnu:/lib/x86_64-linux-gnu/:/usr/local/cuda-10.0/lib:/home/ninja/anaconda3/envs/demo/lib
#export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/ninja/.conda/envs/keras3/lib:/usr/local/lib