The textbook is available online and as a pdf file: Introduction to Higher Mathematics, or you can buy a printed textbook.
Overleaf help; you might want to start with Learn LaTeX in 30 minutes.
A few useful Latex constructions
Naive Set Theory, by Paul Halmos
12 | Wednesday, May 3 | §4.10: 2, 3, 5 §5.1: 9; §5.3: 3; §5.4: 3, 5; §5.5: 7; §5.6: 3, 4 | You may want to start with this file: homework_12.zip. |
11 | Wednesday, 4/26 | §4.7: 7; §4.8: 1, 2, 5, 10, 11; §4.9: 2, 7, 12 | You may want to start with this file: homework_11.zip. |
10 | Wednesday 4/19 | §4.5: 1d, 3, 6; §4.6: 1, 2, 3, 5; §4.7: 3, 5, 6 | You may want to start with this file: homework_10.zip. |
9 | Wednesday 4/12 | §4.2: 2, 6, 7, 8; §4.3: 2, 3, 7; §4.4: 1, 3, 5; | You may want to start with this file: homework_09.zip. |
8 | Wednesday, 4/5 | §3.9: 5a, 6, 7; §3.10: 3, 5, 6, 10, 11 §4.1: 4, 6 | You may want to start with this file: homework_08.zip. |
7 | Friday, 3/10 | §3.6: 8;  §3.7: 2a, 3, 4, 5;  §3.8: 3, 6, 7, 11;  §3.9: 4 | You may want to start with this file: homework_07.zip. |
6 | Wedesday 3/1 | §3.4: 6, 7, 8; §3.5: 2, 3, 4, 5; §3.6: 2, 4, 6 | You may want to start with this file: homework_06.zip. |
5 | Wednesday 2/22 | §3.1: 6, 8; §3.2: 3, 5, 6; §3.3: 3, 4, 6, 11; §3.4: 4 | You may want to start with this file: homework_05.zip. |
4 | Wednesday 2/15 | §2.4: 2; 4; 12 §2.5: 4; 7 §2.6: 2; 4; 5; 7 §3.1: 3 | You may want to start with this file: homework_04.zip. |
3 | Wednesday 2/8 | §2.1: 2; 3; 6 §2.2: 2; 3; 4 §2.3: 3; 4; 5; 6 | You may want to start with this file: homework_03.zip. |
2 | Wednesday 2/1 | §1.4: 2a,b; 4; 6 §1.5: 3; 6; 7 §1.6: 2; 3; 5; 7 | You may want to start with this file: homework_02.zip. |
1 | Wednesday, 1/25 | §1.1: 1a,c; 2a,d,i,j,k; 3a; 4 §1.2: 1; 2; 4c; 5a; 6a §1.3: 3; 4; 8 | You may want to start with this file: homework_01.zip. |