Is this laptop good enough? - 1

Well I wanted to buy a cheap laptop, and the best deal I found was a Lenovo IdeaPad G505 laptop, with the following specs:

Processor: AMD E1-Series E1-2100 1.0GHz Dual core 1 MB cache
Display: 15.6" HD LED Glare Wedge 1366x768
Memory: 4GB DDR3 SDRAM
Storage: 500GB HDD
Optical Device: DVD Recordable (Dual Layer)
Graphics: Integrated Radeon HD 8210
Ports: 2x USB 3.0, USB 2.0, HDMI-out, 2-in-1 card reader (SD/MMC)

Everything seems good except the processor. I may fear its the least powerful from many of the cheap laptops on offer here. They mainly use Intel Celeron's, some with a higher clock speed, for example:

One has a E1-2500 with 2GB's of RAM, Intel 2957U 1.40GHz 2MB Cache with 4GB's of RAM, Intel Dual Core1000M 1.8GHz with 4GB's of RAM. As far as I heard AMD processors are best at gaming and multi-tasking compared to the Intel ones which are best suited for single tasking.

I don't play too much demanding games, GTA San Andreas, Flight Simulator, Programming and Web Surfing(Movies, YouTube).

Am I good with that Lenovo laptop or should I seek alternatives?

You actually have it the wrong way around. Intel is better at multi-tasking. AMD processors are generally faster clock speeds than the intel's but the intel has better cash and within the last 3 iterations have out performed their AMD counter parts. The only time the AMD's seem to be worth it is in cheap builds where the chip used is the A6 or A10 Chips and integrated graphics for movie playback is about all that is required.

Flight simulators are actually very demanding graphically speaking.

The laptops you listed here will be good for web surfing and some basic gaming like what you might play on a tablet. That's about it. Anything more and this machine will probably struggle.
It should play movies relatively well. I would take the intel dual core over the E1 series chip any day of the week.

I would get something with an i3 processor at least. Celeron is junk and that AMD is like my phone. You will wind up waiting for everything. If you aren't going to do a lot of input you would be better off with a tablet. OR if you are just surfing, maybe a Chromebook. If you want to game Xbox or PS4 would be a better deal. Even if you like this one by next year it will be so cluttered and slow you will scream, I know from experience. Save your money and get something better.

You should be getting the specs of the games you intend to play.
Then you can compare the Recommended to what you have as available. (Minimum does not make for good playing enjoyment.)
EXAMPLE:
Skyrim Specs: (Video Graphics is where most machines fail the test)
Recommended
-Windows 7/Vista/XP PC (32 or 64 bit)
-Quad-core Intel or AMD CPU processor
-4GB System RAM
-6GB free HDD (Hard disk drive) space
-DirectX 9.0c compatible NVIDIA or AMD ATI video card with 1GB of RAM: Nvidia GeForce GTX 260 or higher; ATI Radeon HD 4890 or higher
-DirectX compatible sound card
-Internet access for Steam activation