So you're feeling a burning sensation in your Throat Chakra, Crown Chakra and 3rd Eye.
This could be indicative of spiritual blocks in these areas, especially if this burning is uncomfortable for you. I'm assuming you feel this when you're laying on your back or after you're done with the yoga.
If it's not overall uncomfortable, then there's really nothing to worry. The feeling is eventually going to pass, although I do recommend adding meditations focusing on these areas. And you can also meditate on your 6th Chakra, pineal gland, and psychic centers for Clairvoyance/Clairaudience. This can help the energy of your upper chakras flow better.
If any chakra needs more work for opening than others. Can i skip opening others and work on the weaker chakra?? Because others are opened more already. Or what to do?