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Maybe just a detail, but playing table tennis in jeans isn't going to work.
Especially if you want too bend your knees more, you need flexible clothing.
Hi Naresh, I would find a club in Hyderabad and take some coaching. I stayed in Hyderabad for a couple of years and I know its not very easy to find one and sometimes its not very affordable ... http://www.telanganatabletennis.com/tt-training-centers.php
There are a lot of things you could improve but it won't be easy without a coach and good table tennis partners to help you.
Also playing in jeans does not help you in staying low and move the way you need to move.
right now , the grip looks okay even though a little tight around handle ,but there are different approaches to grip , I personally focus on pinching the rubber.
you also need to stay lower and use waist rotation and weight transfer , focus on brushing the ball for more spin etc. we could on and on and you could look at the videos from Brett Clarke / Ping Skills to understand better. But at this stage , the only way to improve would be to scratch your current form and try to relearn the basics , which would not be easy without professional help.
ttmonster is being very helpful and diplomatic. You have a LOT to work on and it wouldn't fit in ten of these text boxes. Not a lot of it will improve in the first 1-2 days. A LOT of us who begin this sport as adults played recreationally and that is what you are doing. Many of us when we were in the recreational player stage were just like you, a rec player wanting to be more, but the basic fundamentals were of a rec player. Heck, I made a ton of vids of me serving, and I was prolly a level below USA club average level, nothing to be proud of for sure. Yet, I still posted footage, so I see your energy.
Almost all of us coached ourselves with next to zero idea of what right is, I did it myself too, I bought an instruction book and prolly was worse off,, I learned a portion of offensive technique and burned in bad technique and habits.
There is no 1-10 thing(s) any of us could tell you to make you quickly do and become a serviceable amature player by many players' standards. Monster has summed it up for you in the best possible response customized for your area. I know Monster personally and his character and advice are sound. His functional knowledge of common and obscure points of American English exceeds many American's and I see you get along pretty damn well with English not being your first language. hang around and share your ride.