SQL Taskbook Level 8.8 of the SQL task book

The tables are given:

authors
id	first_name	last_name
1	Jack	Brown
2	John	Doe
3	Max	White

tags
id	name
1	IT
1	PHP
2	JavaScript
3	React
4	Angular
5	Vue.js
6	C/C++
7	Rust

posts
id	title	likes	author_id
1	Lorem ipsum	3810	2
2	Lorem ipsum dolor sit amet	1913	2
3	Lorem ipsum dolor sit	4111	1
4	Lorem ipsum dolor	6700	3

post_tag
id	post_id	tag_id
1	1	1
2	1	2
3	1	3
4	1	4
5	1	5
6	2	7
7	2	6
8	2	5
9	2	4
10	2	3
11	3	2
12	3	7
13	3	5
14	3	6
15	4	5
16	4	1
17	4	7
18	4	6

Solve the following tasks for them:

Find the author who has the most unique tags in their posts and display their name, the number of unique tags, and a list of those tags.

Find the tag that is present in all posts by the author with the highest total number of likes on his posts. Output the tag name, the author's name, and the total number of likes on his posts.

id	post_id	tag_id
1	1	1
2	1	2
3	1	3
4	1	4
5	1	5
6	2	7
7	2	6
8	2	5
9	2	4
10	2	3
11	3	2
12	3	7
13	3	5
14	3	6
15	4	5
16	4	1
17	4	7
18	4	6

id	post_id	tag_id
1	1	1
2	1	2
3	1	3
4	1	4
5	1	5
6	2	7
7	2	6
8	2	5
9	2	4
10	2	3
11	3	2
12	3	7
13	3	5
14	3	6
15	4	5
16	4	1
17	4	7
18	4	6

id	post_id	tag_id
1	1	1
2	1	2
3	1	3
4	1	4
5	1	5
6	2	7
7	2	6
8	2	5
9	2	4
10	2	3
11	3	2
12	3	7
13	3	5
14	3	6
15	4	5
16	4	1
17	4	7
18	4	6