If the laptop is hanging/freezing that could indicate that it is overheating and you need to clean out the fan / air intakes / cooling fins.
FTFY. It’s good advice, but it could be a hundred other things also.
As others have said, extra memory is always the first place to start to increase performance.
The first place to start is wherever your bottleneck is. Task Manager / More Details / Performance will give you an idea rather than guessing.
On a W10 machine with 4GB of RAM you’d almost certainly get more return on your investment by fitting an SSD.
If you are running Windows 10 there are scripts you run to remove all the default windows apps that take up resources and nobody ever uses. Just search for ‘Windows 10 debloat’
Any performance impact this will have is somewhere between “nominal” and “none,” and advising people who aren’t sure what they’re doing to go Google how to randomly uninstall stuff often doesn’t end well.