I have tried the procedure in "www.circuitbasics.com/setup-lcd-touchscreen-raspberry-pi/" but, I couldn't get it done. It's just showng a background white light but no booting can be seen in it. Can any one help me to fix it? I am using a tinylcd3.5 inch Touch screen.
There is a similar thread here: How to make 3.5" Resistive Touch Screen Usable. You need to use a specific linux image usually provided with the screen which has the relevant drivers and settings already configured.
The reason you are getting a white screen is because linux is still configured to use HDMI and so no ouput is going to the touchscreen.