KDP categories · Top KDP authors
Richard Blum: Amazon KDP author data
As of Nov 6, 2026, Richard Blum has 21 books on Amazon, 20 of them on a best-seller list in the last 30 days (best rank #1), mostly in Linux, Shell, PHP.
| Median price | $27 |
|---|---|
| Price range (middle 50%) | $22.69 – $32.84 |
| Median reviews | 30 |
| Total reviews | 2,379 |
| New books (30 days) | 0 |
| Breakout books (30 days) | 0 |
What stands out
- Amazon lists 3 author pages (separate Author IDs) under this name; this page combines them.
- 95% of the catalog made a best-seller list in the last 30 days: the whole backlist sells, not one hit.
Richard Blum's best-ranked books
-
Linux All-In-One For Dummies (For Dummies (Computer/Tech))
by Richard Blum
- Price$21.43
- Rating4.6
- Reviews169
- Published2022-11
-
CompTIA Linux+ Study Guide: Exam XK0-006 (Sybex Study Guide)
by Richard Blum
- Price$33.78
- Rating4.7
- Reviews30
-
SQL All-in-One For Dummies (For Dummies (Computer/Tech))
by Richard Blum
- Price$22.90
- Rating4.6
- Reviews88
- Published2024-04
-
Linux Command Line and Shell Scripting Bible
by Richard Blum
- Price$43.24
- Rating4.0
- Reviews8
-
SQL Essentials for Dummies
by Richard Blum
- Price$15.08
- Rating4.5
- Reviews5
-
CompTIA Linux+ Study Guide: Exam XK0-005 (Sybex Study Guide)
by Richard Blum
- Price$36
- Rating4.5
- Reviews116
-
PHP, MySQL, & JavaScript All-In-One For Dummies
by Richard Blum
- Price$22.33
- Rating4.4
- Reviews6
- Published2025-07
-
CompTIA Linux+ Study Guide: Exam XK0-006 (Sybex Study Guide)
by Richard Blum
- Price$54
- Rating4.7
- Reviews30
-
Linux Command Line and Shell Scripting Bible
by Richard Blum
- Price$33.92
- Rating4.6
- Reviews335
-
CompTIA Linux+ Certification Kit: Exam XK0-005
by Richard Blum
- Price$52.33
- Rating4.5
- Reviews54
Main categories
FAQ
How many books does Richard Blum have on Amazon?
KDPTop tracks 21 of their books; 20 made an Amazon list in the last 30 days.
Which categories does Richard Blum publish in?
Their books chart most often in Linux, Shell, PHP.
How does Richard Blum price their books?
The median price is $27; half of the books cost $22.69–$32.84.
Has Richard Blum released new books recently?
0 new books in the last 30 days.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.