Can someone help me explain this code?

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Trung Hieu Tran on 30 Mar 2022
Commented: Trung Hieu Tran on 30 Mar 2022
I'm self-learning MATLAB so my knowledge is not really good. I have this MATLAB but I couldn't fully understand what each line does. I hope someone can help me explain them? Thanks.
fs = 48000;
f0 = 2000;
t = 0:1/fs:5/f0-1/fs;
x = sin(2*pi*f0*t);
xn = x + 0.1*randn(size(x));
subplot(211);
plot(t,x);
subplot(212);
plot(t,xn);
hold on;

KSSV on 30 Mar 2022
You can get it yourself, by reading the respective functions documentation.
fs = 48000; % smapling frequency
f0 = 2000; % freqency value
t = 0:1/fs:5/f0-1/fs; % make time steps using frequencies
x = sin(2*pi*f0*t); % make a signal, it is a sine wave here
xn = x + 0.1*randn(size(x)); % add some noise which has a nrmal distribution
subplot(211); % subplot; this will open a figure with two plot options
plot(t,x); % plot the signal
subplot(212);
plot(t,xn); % plot the signal added with noise
hold on;
Trung Hieu Tran on 30 Mar 2022
Thanks KSSV, I'll make sure to read it more to understand

Cris LaPierre on 30 Mar 2022
Consider going through MATLAB Onramp.
You'll also find the help documentation quite detailed, with accompanying examples.