Is the Lenovo A100 good for gaming?

No. It uses Intel UHD integrated graphics, which handles video and light browser games but not modern titles at playable frame rates. Treat it as an office and media machine.

Can I upgrade the RAM or storage later?

Storage is easier: the 1TB SSD can be swapped for a larger drive. RAM is harder because there is only one slot, so the installed 32GB is effectively the maximum unless you replace the module.

Is the i3-N305 fast enough for everyday work?

Yes for browsing, Office documents, email, video calls and streaming. It is not suited to sustained video editing, large spreadsheets with heavy calculation, or software that leans on a dedicated GPU.

Does it come with a keyboard and mouse?

Lenovo all-in-ones in this line typically ship with a wired or wireless keyboard and mouse, but confirm the box contents with the seller before ordering, since bundles vary by listing.

Can I connect a second monitor?

Yes. There is one HDMI output, so you can add an external display alongside the built-in 23.8-inch screen.

When is the best time to buy it?

All-in-ones like this see the deepest discounts around back-to-school and Black Friday. Check the price history before buying, since list prices on entry all-in-ones swing widely.