Hands-On SEO Tools: Ahrefs, Semrush & Screaming Frog

Why tools matter

So far you have done SEO by hand — looking at one page, one search, one title. That works for learning, but a real website has hundreds of pages and competitors you cannot eyeball. SEO tools are programs that crawl your whole site, watch thousands of keywords, and show you what other sites are doing — all in minutes. Employers assume you can use at least one of them, so knowing the workflow matters as much as knowing the theory.

Think of it like a doctor. You already learned what a healthy site looks like; these tools are the X-ray machine and blood test that find the problems you cannot see by looking.

The main tools and what each is for

There are four names you will hear again and again. You do not need all of them — most pros pick one all-in-one tool plus a crawler. Here is who does what:

New words, defined simply

• A site audit is an automatic health-check of your whole website — the tool crawls every page and lists problems (slow pages, missing titles, broken links).
• A crawler (like Screaming Frog) is a program that follows your links page by page, exactly the way Google does, and records what it finds.
• Site Explorer (Ahrefs’ name for it) is a screen where you type any website and see its backlinks and top keywords — including a competitor’s.
• Domain Rating (DR) is Ahrefs’ 0–100 score of how strong a site’s backlink profile is. Higher is stronger. Semrush’s version is called Authority Score.

A worked example: auditing Sweet Crumbs

Imagine you just got Sweet Crumbs as a client and you open Semrush to audit the site. Here is the exact order a pro follows on day one:

1. Type sweetcrumbs.in into the Site Audit tool and start a crawl. The tool visits every page automatically.
2. Wait a few minutes, then read the Health Score (a 0–100 summary). Say it comes back at 72.
3. Open the Errors list — the most serious problems. You see 4 pages with a missing title tag and 2 broken internal links.
4. Open the Warnings list — less urgent issues, like 6 images missing alt text and 3 slow pages.
5. Export the list and turn each issue into a task: write the 4 missing titles, fix the 2 broken links, add alt text, compress the slow images.
6. Re-run the crawl in a week and watch the Health Score climb as you fix things.

A simplified version of what the audit screen shows:

Site Audit: sweetcrumbs.in
Health Score: 72 / 100

ERRORS (fix first)
  4  Pages have no <title> tag
  2  Internal links are broken (404)

WARNINGS (fix next)
  6  Images have no alt text
  3  Pages take over 3s to load

NOTICES (nice to have)
 11  Pages have no meta description

Reading a keyword report

In Ahrefs’ or Semrush’s keyword tool, you type a seed word like eggless cake and it returns a table. The columns mean:

Screaming Frog: the free crawler

Screaming Frog is a program you install on your computer. You paste your site address, click Start, and it crawls every page and builds a giant table. Its best use is spotting technical problems fast:

• Response Codes tab — find any page returning a 404 (not found) or 301 (redirect).
• Page Titles tab — instantly see pages with missing, duplicate or too-long titles.
• Images tab — list images that are huge (slow) or missing alt text.