Cheap and best Laptop to buy online

You have not specified any price range for your query. It would have been easier to list out the options if there was a specific price point. However, a few good options could be -

1. Dell Vostro 3446 Laptop

You can buy this laptop in grey color option. It is powered by Core i3 (4th Generation). Clock speed reads 1.3 GHz. 4 GB RAM should be quite enough for all your needs. The laptop has 500 GB hard drive. It also has a tray load DVD drive. The display reads 14 inch at 1366 x 768 pixels resolution. The display offers HD resolution along with anti glare and backlight. Graphics are handled by NVIDIA GeForce GT 820M. You will also get inbuilt 720p HD webcam along with microphones. As for the ports, you will get one USB 3.0 and two USB 2.0 ports. The laptop comes with McAfee eCard and CD.
Yiu may buy it at Rs. 29259 on SnapDeal.

2. Lenovo G50-80 Notebook

It is one of the finest laptops with fifth gen intel processor. The clock speed reads 2.0 GHz. The laptop has a 4 GB RAM capacity. You have access to 1 TB of hard drive capacity.
The DVD drive has the read/write speeds of upto 8x. It comes with DOS preinstalled. You can install any of your favourite operating systems. The display size is 15.6 inch at 1366 x 768 pixels. The screen is LED backlit. Intel HD takes care of your graphic needs. The laptop comes with two USB 2.0 and one USB 3.0 ports. You also have access to a 2 in 1 card reader.

Buy it at Rs. 25599 on SnapDeal.

3. Acer Aspire E15

Launched under Aspire E series, the laptop is available in Charcoal grey color option. The laptop is powered by Intel Core i3 fifth gen. The clock speed reads 2.0 GHz. The RAM capacity is 4 GB. The device storage capacity is 1 TB. You get M-DISC Ready Drive which has 8x read/write speed. Aspire E15 comes with Linux preinstalled. It has a 15.6 inch display at 1366 x 768 resolution. The TFT LCD display boasts of High Brightness Acer CineCrystal LED-backlighting. NVIDIA 920M handles your graphic needs.The webcam features Hd Webcam with 1280 X 720 Resolution and 720P HD Audio/Video Recording. This laptop comes with two USB 3.0 and one USB 2.0 ports.

You may buy it at Rs. 27999 on SnapDeal.

4. Dell Inspiron 15 3542

Launched under Inspiron 15 series, the laptop is available in black color option. It is powered by Intel i3 fifth gen processor. The clock speed is 1.7 GHz. The in built 4 GB RAM can be expanded to 8 GB if you need to. The storage capacity of the hard drive reads 1 TB. The tray load DVD has a read/write capacity of 8x. The 15.6 inch display has LED Backlit Display with Truelife and HD Resolution. Graphics are handled Intel HD graphics 4400. The laptop provides you one USB 3.0 and two USB 2.0 ports.

It can be bought at Rs. 28900 on SnapDeal.

As there is lack of pricing information in your question then I assume that you meant under 20K as cheap, over 20K to 35K as budget laptop. So here are some of my suggestion keeping in mind the above assumption.

1. Dell Vostro 15 3558 : This is one of the good model with good performance specs under 20K. This laptop has 4GB RAM and 500GB HDD. It has Dual Core processor which can be good enough for casual usage. It has 15'' screen which is good for those who want more screen size. It has free DOS OS installed with it. But you can upgrade to Windows 10 if you want. The price of the laptop online is 19899 Rs.

2. Lenovo G50-45 80E301CYIN: The G series laptops from lenovo have some good reviews. The price range for the laptops are from 18K to 35K. This model has 1.35GHz AMD E16010 processor with 2GB RAM and 500GB HDD. The model being released prior to Windows 10, it has Windows 8.1 installed in it. I'd say it has a good spec for casual usage and for normal gaming needs. It is moderately priced at : 19,650.00 Rs.

3. HP 15-AC168TU: This model from HP has Pentium 3825U process with 4GB RAM and 500GB HDD. The good thing about this model is that it has Windows 10 installed. So you are saved with the upgrade costs. The screen size of the laptop has 15.6-inch screen. I'd say for this price tag, it is definitely casual Though most of the HP models often have performance issues. I'd say this model has very good set of reviews from the customers. It is priced at 21,790 Rs.

4.Fujitsu VFY:A5550MP80JDE: This model from Fujitsu has Intel CoreTM i3-5005U processor with 8GB RAM and 500GB HDD. It has 15.6'' inch display screen which makes it a very good model for business and gaming. It doesn't have any OS installed with it so you have to either install Linux or Windows OS on your own. You get the driver CD for Windows 7, 8.1 and 10. In terms of performance the specification are really good at this price. Model is priced at : 23,999 Rs.

5. Acer Aspire E E5-573G-39G8: This model from Acer has CoreTM i3-5005U processor Dual-core 2 GHz with 4GB with 1TB HDD. Laptop also has dedicated graphic from Nvidia GeForce 920M. Laptop has display size of 15.6'' inch screen. Laptop has Linux installed on it, which you can replace with Windows 10 if you wish to pay the upgrade price. This model is high performance so it falls into budget price. Online the price of this model is set at : 28,890 Rs.

These are some of the laptops that I can suggest if you are looking for moderately cheap priced laptop. Do note that going below 20K budget may not give you more than 2GB RAM. So you may find that installing Windows 10 on such laptops will have some performance issues.

Here are a few top rated laptops that you get with the best features within the best ever price:

1. iBall Excelance CompBook 11.6-inch Laptop (Atom Z3735F/2GB/32GB/Windows 10/Integrated Graphics)

You get this laptop in with two display options, 11.6 inches and
14 inches with Integrated Graphics. The laptop runs on 1.83GHz Intel Atom Z3735F processor with the help of 2GB DDR3 RAM and a flash storage of 32GB. The operating system is Windows 10 and it weighs around 1.09kg .
Price: Rs. 9,499 for 11.6 inches and Rs. 13,675 for the 14 inches model.

2. Asus E200HA-FD0004TS 11.6-inch Laptop (Atom x5-Z8300/2GB/32GB/Windows 10/Integrated Graphics), Blue

The laptop is powered by 1.84GHz Intel Atom x5-Z8300 processor with a 2GB DDR3 RAM. The internal storage is of 32GB with a 11.6-inch screen and Intel HD Graphics. The operating system of the laptop is Windows 10 and it is a lightweight device of only 0.98kg.
Price: Rs.15,679

3. ACER Aspire ES1-131-C8RL,NX.MYKSI.009- Celron dualcore ,2GB DDR3 ,500GB , 11.6" LED, windows 10,Black

The laptop runs on Intel Celron Dualcore N3050 with 2GB DDR3 RAM and a 500GB HDD with 11.6" LED. The Operating system is WINDOWS 10

Price: Rs.17485