Fix grammar and tutorial names

Signed-off-by: Astro-Kirsty <AstroKirsty@gmail.com>

cta.html

@@ -100,26 +100,25 @@ <h2 id="introduction"><a href="#intro">Introduction</a></h2>
         <p>
             The <a href="https://www.cta-observatory.org/">Cherenkov Telescope Array</a> (CTA) is the next generation
             ground-based observatory for gamma-ray astronomy at very-high energies.
-            Gammapy has been chosen in June 1<sup>st</sup>, 2021 to be the official Science Analysis Tool library for the CTA Observatory (see <a
+            Gammapy was chosen on June 1<sup>st</sup> 2021 to be the official Science Analysis Tool library for the CTA Observatory (see <a
                 href="https://www.cta-observatory.org/ctao-adopts-the-gammapy-software-package-for-science-analysis/">CTAO news</a>).
         </p>
         <p>
-            This page provides a little bit of information and links to useful resources concerning simulation and
+            This page provides some information and links to useful resources concerning simulation and
             analysis of CTA data with Gammapy.
-            Most of the pages we link to here require a CTA user account to access the information.
+            Most of the pages we link here require a CTA user account to access the information.
         </p>
 
         <br><br>
         <h2 id="getting-started"><a href="#started">Getting started</a></h2>
         <p>
             To learn how to use Gammapy for CTA analysis, use the
             <a href="https://docs.gammapy.org/dev/tutorials/index.html">Gammapy tutorials</a>.
-            We suggest you do the "Getting started with Gammapy" one first, and then continue with
-            "CTA first data challenge (1DC) with Gammapy" and "CTA data analysis with Gammapy"
-            and finally the "CTA 2D source fitting with Sherpa".
+            We suggest you first consult the "Getting started" page. Then continue with the "CTA with Gammapy"
+            tutorial, followed by the "3D map simulation" tutorial.
         </p>
         <p>
-            If you have questions, please post on the Gammapy CTA mailing list or contact the  Gammapy coordination committee (see <a
+            If you have any questions, please post on the Gammapy CTA mailing list or contact the Gammapy coordination committee (see <a
                 href="contact.html">Gammapy contact page</a>)
         </p>
         <p>
@@ -133,8 +132,8 @@ <h2 id="resources"><a href="#resources">Resources</a></h2>
         <ul>
             <li>
                 <a href="https://forge.in2p3.fr/projects/data-challenge-1-dc-1/wiki">CTA first data challenge (CTA DC-1)
-                    page</a>
-                This page contains information about data, sky models, links to forums for discussion and checks, ... (private access with the old access system)
+                    page</a> - this page contains information about data, sky models, links to forums for discussion and
+                checks, ... (private access with the old access system)
             </li>
             <li>
                 <a href="https://github.com/gammasky/cta-analyses">cta-analyses</a> - a private repository on Github
@@ -147,7 +146,7 @@ <h2 id="resources"><a href="#resources">Resources</a></h2>
             <li>
                 If you're doing simulations or analysis for CTA with Gammapy and would like to discuss your results or
                 get help, please join the <a href="mailto:gammapy-cta-l@in2p3.fr">Gammapy mailing list</a>,
-                the regular Gammapy calls.
+                and the regular Gammapy calls.
             </li>
         </ul>