Entry-level is a marketing term for the cheapest smartphones. They are not bad phones, they are just scaled-down versions of higher-level phones.
These are suitable for people who don’t want to buy a costly smartphone but want most of the features with some compromises. These are also better for children and students who can drop and break the phones or lose them somehow.
You won’t get a great camera and Display hardware but you can definitely seek a larger battery capacity.
3GB RAM isn’t bad. But for smoother multitasking, look for 4GB or more of onboard RAM.
Some manufacturers are also offering entry-level phones with android go versions featuring spreadtrum processors and 2 GB maximum ram.